// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/api.h"

#include <string.h> // For memcpy, strlen.
#include <cmath> // For isnan.
#include <limits>
#include <vector>

#include "src/api-inl.h"

#include "include/v8-profiler.h"
#include "include/v8-testing.h"
#include "include/v8-util.h"
#include "src/accessors.h"
#include "src/api-natives.h"
#include "src/assert-scope.h"
#include "src/base/functional.h"
#include "src/base/logging.h"
#include "src/base/platform/platform.h"
#include "src/base/platform/time.h"
#include "src/base/safe_conversions.h"
#include "src/base/utils/random-number-generator.h"
#include "src/bootstrapper.h"
#include "src/builtins/builtins-utils.h"
#include "src/char-predicates-inl.h"
#include "src/compiler-dispatcher/compiler-dispatcher.h"
#include "src/compiler.h"
#include "src/contexts.h"
#include "src/conversions-inl.h"
#include "src/counters.h"
#include "src/cpu-features.h"
#include "src/date.h"
#include "src/debug/debug-coverage.h"
#include "src/debug/debug-evaluate.h"
#include "src/debug/debug-type-profile.h"
#include "src/debug/debug.h"
#include "src/debug/liveedit.h"
#include "src/deoptimizer.h"
#include "src/detachable-vector.h"
#include "src/execution.h"
#include "src/frames-inl.h"
#include "src/gdb-jit.h"
#include "src/global-handles.h"
#include "src/globals.h"
#include "src/heap/heap-inl.h"
#include "src/icu_util.h"
#include "src/isolate-inl.h"
#include "src/json-parser.h"
#include "src/json-stringifier.h"
#include "src/messages.h"
#include "src/microtask-queue.h"
#include "src/objects-inl.h"
#include "src/objects/api-callbacks.h"
#include "src/objects/embedder-data-array-inl.h"
#include "src/objects/embedder-data-slot-inl.h"
#include "src/objects/frame-array-inl.h"
#include "src/objects/hash-table-inl.h"
#include "src/objects/heap-object.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/js-collection-inl.h"
#include "src/objects/js-generator-inl.h"
#include "src/objects/js-promise-inl.h"
#include "src/objects/js-regexp-inl.h"
#include "src/objects/module-inl.h"
#include "src/objects/oddball.h"
#include "src/objects/ordered-hash-table-inl.h"
#include "src/objects/slots.h"
#include "src/objects/smi.h"
#include "src/objects/stack-frame-info-inl.h"
#include "src/objects/templates.h"
#include "src/parsing/parse-info.h"
#include "src/parsing/parser.h"
#include "src/parsing/scanner-character-streams.h"
#include "src/pending-compilation-error-handler.h"
#include "src/profiler/cpu-profiler.h"
#include "src/profiler/heap-profiler.h"
#include "src/profiler/heap-snapshot-generator-inl.h"
#include "src/profiler/profile-generator-inl.h"
#include "src/profiler/tick-sample.h"
#include "src/property-descriptor.h"
#include "src/property-details.h"
#include "src/property.h"
#include "src/prototype.h"
#include "src/runtime-profiler.h"
#include "src/runtime/runtime.h"
#include "src/simulator.h"
#include "src/snapshot/code-serializer.h"
#include "src/snapshot/natives.h"
#include "src/snapshot/partial-serializer.h"
#include "src/snapshot/read-only-serializer.h"
#include "src/snapshot/snapshot.h"
#include "src/snapshot/startup-serializer.h"
#include "src/startup-data-util.h"
#include "src/string-hasher.h"
#include "src/tracing/trace-event.h"
#include "src/trap-handler/trap-handler.h"
#include "src/unicode-inl.h"
#include "src/v8.h"
#include "src/v8threads.h"
#include "src/value-serializer.h"
#include "src/version.h"
#include "src/vm-state-inl.h"
#include "src/wasm/streaming-decoder.h"
#include "src/wasm/wasm-engine.h"
#include "src/wasm/wasm-objects-inl.h"
#include "src/wasm/wasm-result.h"
#include "src/wasm/wasm-serialization.h"

#if V8_OS_LINUX || V8_OS_MACOSX
#include <signal.h>
#include "include/v8-wasm-trap-handler-posix.h"
#include "src/trap-handler/handler-inside-posix.h"
#endif

#if V8_OS_WIN
//#include <versionhelpers.h>
#include <windows.h>
#include "include/v8-wasm-trap-handler-win.h"
#include "src/trap-handler/handler-inside-win.h"
#if V8_TARGET_ARCH_X64
#include "src/unwinding-info-win64.h"
#endif // V8_TARGET_ARCH_X64
#endif // V8_OS_WIN

#include "v8-debug.h"

namespace v8 {

/*
 * Most API methods should use one of the three macros:
 *
 * ENTER_V8, ENTER_V8_NO_SCRIPT, ENTER_V8_NO_SCRIPT_NO_EXCEPTION.
 *
 * The latter two assume that no script is executed, and no exceptions are
 * scheduled in addition (respectively). Creating a pending exception and
 * removing it before returning is ok.
 *
 * Exceptions should be handled either by invoking one of the
 * RETURN_ON_FAILED_EXECUTION* macros.
 *
 * Don't use macros with DO_NOT_USE in their name.
 *
 * TODO(jochen): Document debugger specific macros.
 * TODO(jochen): Document LOG_API and other RuntimeCallStats macros.
 * TODO(jochen): All API methods should invoke one of the ENTER_V8* macros.
 * TODO(jochen): Remove calls form API methods to DO_NOT_USE macros.
 */

#define LOG_API(isolate, class_name, function_name)                             \
    i::RuntimeCallTimerScope _runtime_timer(                                    \
        isolate, i::RuntimeCallCounterId::kAPI_##class_name##_##function_name); \
    LOG(isolate, ApiEntryCall("v8::" #class_name "::" #function_name))

#define ENTER_V8_DO_NOT_USE(isolate) i::VMState<v8::OTHER> __state__((isolate))

#define ENTER_V8_HELPER_DO_NOT_USE(isolate, context, class_name,    \
    function_name, bailout_value,                                   \
    HandleScopeClass, do_callback)                                  \
    if (IsExecutionTerminatingCheck(isolate)) {                     \
        return bailout_value;                                       \
    }                                                               \
    HandleScopeClass handle_scope(isolate);                         \
    CallDepthScope<do_callback> call_depth_scope(isolate, context); \
    LOG_API(isolate, class_name, function_name);                    \
    i::VMState<v8::OTHER> __state__((isolate));                     \
    bool has_pending_exception = false

#define PREPARE_FOR_DEBUG_INTERFACE_EXECUTION_WITH_ISOLATE(isolate, T)         \
    if (IsExecutionTerminatingCheck(isolate)) {                                \
        return MaybeLocal<T>();                                                \
    }                                                                          \
    InternalEscapableScope handle_scope(isolate);                              \
    CallDepthScope<false> call_depth_scope(isolate, v8::Local<v8::Context>()); \
    i::VMState<v8::OTHER> __state__((isolate));                                \
    bool has_pending_exception = false

#define PREPARE_FOR_EXECUTION_WITH_CONTEXT(context, class_name, function_name, \
    bailout_value, HandleScopeClass,                                           \
    do_callback)                                                               \
    auto isolate = context.IsEmpty()                                           \
        ? i::Isolate::Current()                                                \
        : reinterpret_cast<i::Isolate*>(context->GetIsolate());                \
    ENTER_V8_HELPER_DO_NOT_USE(isolate, context, class_name, function_name,    \
        bailout_value, HandleScopeClass, do_callback);

#define PREPARE_FOR_EXECUTION(context, class_name, function_name, T)       \
    PREPARE_FOR_EXECUTION_WITH_CONTEXT(context, class_name, function_name, \
        MaybeLocal<T>(), InternalEscapableScope,                           \
        false)

// weolar: do_callback change to false
#define ENTER_V8(isolate, context, class_name, function_name, bailout_value, \
    HandleScopeClass)                                                        \
    ENTER_V8_HELPER_DO_NOT_USE(isolate, context, class_name, function_name,  \
        bailout_value, HandleScopeClass, false)

#ifdef DEBUG
#define ENTER_V8_NO_SCRIPT(isolate, context, class_name, function_name,     \
    bailout_value, HandleScopeClass)                                        \
    ENTER_V8_HELPER_DO_NOT_USE(isolate, context, class_name, function_name, \
        bailout_value, HandleScopeClass, false);                            \
    i::DisallowJavascriptExecutionDebugOnly __no_script__((isolate))

#define ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate)                      \
    i::VMState<v8::OTHER> __state__((isolate));                       \
    i::DisallowJavascriptExecutionDebugOnly __no_script__((isolate)); \
    i::DisallowExceptions __no_exceptions__((isolate))

#define ENTER_V8_FOR_NEW_CONTEXT(isolate)       \
    i::VMState<v8::OTHER> __state__((isolate)); \
    i::DisallowExceptions __no_exceptions__((isolate))
#else
#define ENTER_V8_NO_SCRIPT(isolate, context, class_name, function_name,     \
    bailout_value, HandleScopeClass)                                        \
    ENTER_V8_HELPER_DO_NOT_USE(isolate, context, class_name, function_name, \
        bailout_value, HandleScopeClass, false)

#define ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate) \
    i::VMState<v8::OTHER> __state__((isolate));

#define ENTER_V8_FOR_NEW_CONTEXT(isolate) \
    i::VMState<v8::OTHER> __state__((isolate));
#endif // DEBUG

#define EXCEPTION_BAILOUT_CHECK_SCOPED_DO_NOT_USE(isolate, value) \
    do {                                                          \
        if (has_pending_exception) {                              \
            call_depth_scope.Escape();                            \
            return value;                                         \
        }                                                         \
    } while (false)

#define RETURN_ON_FAILED_EXECUTION(T) \
    EXCEPTION_BAILOUT_CHECK_SCOPED_DO_NOT_USE(isolate, MaybeLocal<T>())

#define RETURN_ON_FAILED_EXECUTION_PRIMITIVE(T) \
    EXCEPTION_BAILOUT_CHECK_SCOPED_DO_NOT_USE(isolate, Nothing<T>())

#define RETURN_TO_LOCAL_UNCHECKED(maybe_local, T) \
    return maybe_local.FromMaybe(Local<T>());

#define RETURN_ESCAPED(value) return handle_scope.Escape(value);

namespace {

    Local<Context> ContextFromNeverReadOnlySpaceObject(
        i::Handle<i::JSReceiver> obj)
    {
        return reinterpret_cast<v8::Isolate*>(obj->GetIsolate())->GetCurrentContext();
    }

    class InternalEscapableScope : public v8::EscapableHandleScope {
    public:
        explicit inline InternalEscapableScope(i::Isolate* isolate)
            : v8::EscapableHandleScope(reinterpret_cast<v8::Isolate*>(isolate))
        {
        }
    };

// TODO(jochen): This should be #ifdef DEBUG
#ifdef V8_CHECK_MICROTASKS_SCOPES_CONSISTENCY
    void CheckMicrotasksScopesConsistency(i::MicrotaskQueue* microtask_queue)
    {
        if (microtask_queue && microtask_queue->microtasks_policy() == v8::MicrotasksPolicy::kScoped) {
            DCHECK(microtask_queue->GetMicrotasksScopeDepth() || !microtask_queue->DebugMicrotasksScopeDepthIsZero());
        }
    }
#endif

    template <bool do_callback>
    class CallDepthScope {
    public:
        explicit CallDepthScope(i::Isolate* isolate, Local<Context> context)
            : isolate_(isolate)
            , context_(context)
            , escaped_(false)
            , safe_for_termination_(isolate->next_v8_call_is_safe_for_termination())
            , interrupts_scope_(isolate_, i::StackGuard::TERMINATE_EXECUTION,
                  isolate_->only_terminate_in_safe_scope()
                      ? (safe_for_termination_
                              ? i::InterruptsScope::kRunInterrupts
                              : i::InterruptsScope::kPostponeInterrupts)
                      : i::InterruptsScope::kNoop)
        {
            isolate_->handle_scope_implementer()->IncrementCallDepth();
            isolate_->set_next_v8_call_is_safe_for_termination(false);
            if (!context.IsEmpty()) {
                i::Handle<i::Context> env = Utils::OpenHandle(*context);
                i::HandleScopeImplementer* impl = isolate->handle_scope_implementer();
                if (!isolate->context().is_null() && isolate->context()->native_context() == env->native_context()) {
                    context_ = Local<Context>();
                } else {
                    impl->SaveContext(isolate->context());
                    isolate->set_context(*env);
                }
            }
            if (do_callback)
                isolate_->FireBeforeCallEnteredCallback();
        }
        ~CallDepthScope()
        {
            i::MicrotaskQueue* microtask_queue = isolate_->default_microtask_queue();
            if (!context_.IsEmpty()) {
                i::HandleScopeImplementer* impl = isolate_->handle_scope_implementer();
                isolate_->set_context(impl->RestoreContext());

                i::Handle<i::Context> env = Utils::OpenHandle(*context_);
                microtask_queue = env->native_context()->microtask_queue();
            }
            if (!escaped_)
                isolate_->handle_scope_implementer()->DecrementCallDepth();
            if (do_callback)
                isolate_->FireCallCompletedCallback(microtask_queue);
// TODO(jochen): This should be #ifdef DEBUG
#ifdef V8_CHECK_MICROTASKS_SCOPES_CONSISTENCY
            if (do_callback)
                CheckMicrotasksScopesConsistency(microtask_queue);
#endif
            isolate_->set_next_v8_call_is_safe_for_termination(safe_for_termination_);
        }

        void Escape()
        {
            DCHECK(!escaped_);
            escaped_ = true;
            auto handle_scope_implementer = isolate_->handle_scope_implementer();
            handle_scope_implementer->DecrementCallDepth();
            bool clear_exception = handle_scope_implementer->CallDepthIsZero() && isolate_->thread_local_top()->try_catch_handler_ == nullptr;
            isolate_->OptionalRescheduleException(clear_exception);
        }

    private:
        i::Isolate* const isolate_;
        Local<Context> context_;
        bool escaped_;
        bool do_callback_;
        bool safe_for_termination_;
        i::InterruptsScope interrupts_scope_;
    };

} // namespace

static ScriptOrigin GetScriptOriginForScript(i::Isolate* isolate,
    i::Handle<i::Script> script)
{
    i::Handle<i::Object> scriptName(script->GetNameOrSourceURL(), isolate);
    i::Handle<i::Object> source_map_url(script->source_mapping_url(), isolate);
    i::Handle<i::FixedArray> host_defined_options(script->host_defined_options(),
        isolate);
    v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
    ScriptOriginOptions options(script->origin_options());
    v8::ScriptOrigin origin(
        Utils::ToLocal(scriptName),
        v8::Integer::New(v8_isolate, script->line_offset()),
        v8::Integer::New(v8_isolate, script->column_offset()),
        v8::Boolean::New(v8_isolate, options.IsSharedCrossOrigin()),
        v8::Integer::New(v8_isolate, script->id()),
        Utils::ToLocal(source_map_url),
        v8::Boolean::New(v8_isolate, options.IsOpaque()),
        v8::Boolean::New(v8_isolate, script->type() == i::Script::TYPE_WASM),
        v8::Boolean::New(v8_isolate, options.IsModule()),
        Utils::ToLocal(host_defined_options));
    return origin;
}

// --- E x c e p t i o n   B e h a v i o r ---

void i::FatalProcessOutOfMemory(i::Isolate* isolate, const char* location)
{
    i::V8::FatalProcessOutOfMemory(isolate, location, false);
}

// When V8 cannot allocate memory FatalProcessOutOfMemory is called. The default
// OOM error handler is called and execution is stopped.
void i::V8::FatalProcessOutOfMemory(i::Isolate* isolate, const char* location,
    bool is_heap_oom)
{
    char last_few_messages[Heap::kTraceRingBufferSize + 1];
    char js_stacktrace[Heap::kStacktraceBufferSize + 1];
    i::HeapStats heap_stats;

    if (isolate == nullptr) {
        isolate = Isolate::TryGetCurrent();
    }

    if (isolate == nullptr) {
        // If the Isolate is not available for the current thread we cannot retrieve
        // memory information from the Isolate. Write easy-to-recognize values on
        // the stack.
        memset(last_few_messages, 0x0BADC0DE, Heap::kTraceRingBufferSize + 1);
        memset(js_stacktrace, 0x0BADC0DE, Heap::kStacktraceBufferSize + 1);
        memset(&heap_stats, 0xBADC0DE, sizeof(heap_stats));
        // Note that the embedder's oom handler is also not available and therefore
        // won't be called in this case. We just crash.
        FATAL("Fatal process out of memory: %s", location);
        UNREACHABLE();
    }

    memset(last_few_messages, 0, Heap::kTraceRingBufferSize + 1);
    memset(js_stacktrace, 0, Heap::kStacktraceBufferSize + 1);

    intptr_t start_marker;
    heap_stats.start_marker = &start_marker;
    size_t ro_space_size;
    heap_stats.ro_space_size = &ro_space_size;
    size_t ro_space_capacity;
    heap_stats.ro_space_capacity = &ro_space_capacity;
    size_t new_space_size;
    heap_stats.new_space_size = &new_space_size;
    size_t new_space_capacity;
    heap_stats.new_space_capacity = &new_space_capacity;
    size_t old_space_size;
    heap_stats.old_space_size = &old_space_size;
    size_t old_space_capacity;
    heap_stats.old_space_capacity = &old_space_capacity;
    size_t code_space_size;
    heap_stats.code_space_size = &code_space_size;
    size_t code_space_capacity;
    heap_stats.code_space_capacity = &code_space_capacity;
    size_t map_space_size;
    heap_stats.map_space_size = &map_space_size;
    size_t map_space_capacity;
    heap_stats.map_space_capacity = &map_space_capacity;
    size_t lo_space_size;
    heap_stats.lo_space_size = &lo_space_size;
    size_t code_lo_space_size;
    heap_stats.code_lo_space_size = &code_lo_space_size;
    size_t global_handle_count;
    heap_stats.global_handle_count = &global_handle_count;
    size_t weak_global_handle_count;
    heap_stats.weak_global_handle_count = &weak_global_handle_count;
    size_t pending_global_handle_count;
    heap_stats.pending_global_handle_count = &pending_global_handle_count;
    size_t near_death_global_handle_count;
    heap_stats.near_death_global_handle_count = &near_death_global_handle_count;
    size_t free_global_handle_count;
    heap_stats.free_global_handle_count = &free_global_handle_count;
    size_t memory_allocator_size;
    heap_stats.memory_allocator_size = &memory_allocator_size;
    size_t memory_allocator_capacity;
    heap_stats.memory_allocator_capacity = &memory_allocator_capacity;
    size_t malloced_memory;
    heap_stats.malloced_memory = &malloced_memory;
    size_t malloced_peak_memory;
    heap_stats.malloced_peak_memory = &malloced_peak_memory;
    size_t objects_per_type[LAST_TYPE + 1] = { 0 };
    heap_stats.objects_per_type = objects_per_type;
    size_t size_per_type[LAST_TYPE + 1] = { 0 };
    heap_stats.size_per_type = size_per_type;
    int os_error;
    heap_stats.os_error = &os_error;
    heap_stats.last_few_messages = last_few_messages;
    heap_stats.js_stacktrace = js_stacktrace;
    intptr_t end_marker;
    heap_stats.end_marker = &end_marker;
    if (isolate->heap()->HasBeenSetUp()) {
        // BUG(1718): Don't use the take_snapshot since we don't support
        // HeapIterator here without doing a special GC.
        isolate->heap()->RecordStats(&heap_stats, false);
        char* first_newline = strchr(last_few_messages, '\n');
        if (first_newline == nullptr || first_newline[1] == '\0')
            first_newline = last_few_messages;
        PrintF("\n<--- Last few GCs --->\n%s\n", first_newline);
        PrintF("\n<--- JS stacktrace --->\n%s\n", js_stacktrace);
    }
    Utils::ReportOOMFailure(isolate, location, is_heap_oom);
    // If the fatal error handler returns, we stop execution.
    FATAL("API fatal error handler returned after process out of memory");
}

void Utils::ReportApiFailure(const char* location, const char* message)
{
    i::Isolate* isolate = i::Isolate::Current();
    FatalErrorCallback callback = nullptr;
    if (isolate != nullptr) {
        callback = isolate->exception_behavior();
    }
    if (callback == nullptr) {
        base::OS::PrintError("\n#\n# Fatal error in %s\n# %s\n#\n\n", location,
            message);
        base::OS::Abort();
    } else {
        callback(location, message);
    }
    isolate->SignalFatalError();
}

void Utils::ReportOOMFailure(i::Isolate* isolate, const char* location,
    bool is_heap_oom)
{
    OOMErrorCallback oom_callback = isolate->oom_behavior();
    if (oom_callback == nullptr) {
        // TODO(wfh): Remove this fallback once Blink is setting OOM handler. See
        // crbug.com/614440.
        FatalErrorCallback fatal_callback = isolate->exception_behavior();
        if (fatal_callback == nullptr) {
            base::OS::PrintError("\n#\n# Fatal %s OOM in %s\n#\n\n",
                is_heap_oom ? "javascript" : "process", location);
            base::OS::Abort();
        } else {
            fatal_callback(location,
                is_heap_oom
                    ? "Allocation failed - JavaScript heap out of memory"
                    : "Allocation failed - process out of memory");
        }
    } else {
        oom_callback(location, is_heap_oom);
    }
    isolate->SignalFatalError();
}

static inline bool IsExecutionTerminatingCheck(i::Isolate* isolate)
{
    if (isolate->has_scheduled_exception()) {
        return isolate->scheduled_exception() == i::ReadOnlyRoots(isolate).termination_exception();
    }
    return false;
}

void V8::SetNativesDataBlob(StartupData* natives_blob)
{
    i::V8::SetNativesBlob(natives_blob);
}

void V8::SetSnapshotDataBlob(StartupData* snapshot_blob)
{
    i::V8::SetSnapshotBlob(snapshot_blob);
}

namespace {

    class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
    public:
        void* Allocate(size_t length) override
        {
#if V8_OS_AIX && _LINUX_SOURCE_COMPAT
            // Work around for GCC bug on AIX
            // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79839
            void* data = __linux_calloc(length, 1);
#else
            void* data = calloc(length, 1);
#endif
            return data;
        }

        void* AllocateUninitialized(size_t length) override
        {
#if V8_OS_AIX && _LINUX_SOURCE_COMPAT
            // Work around for GCC bug on AIX
            // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79839
            void* data = __linux_malloc(length);
#else
            void* data = malloc(length);
#endif
            return data;
        }

        void Free(void* data, size_t) override { free(data); }
    };

    struct SnapshotCreatorData {
        explicit SnapshotCreatorData(Isolate* isolate)
            : isolate_(isolate)
            , default_context_()
            , contexts_(isolate)
            , created_(false)
        {
        }

        static SnapshotCreatorData* cast(void* data)
        {
            return reinterpret_cast<SnapshotCreatorData*>(data);
        }

        ArrayBufferAllocator allocator_;
        Isolate* isolate_;
        Persistent<Context> default_context_;
        SerializeInternalFieldsCallback default_embedder_fields_serializer_;
        PersistentValueVector<Context> contexts_;
        std::vector<SerializeInternalFieldsCallback> embedder_fields_serializers_;
        bool created_;
    };

} // namespace

SnapshotCreator::SnapshotCreator(Isolate* isolate,
    const intptr_t* external_references,
    StartupData* existing_snapshot)
{
    SnapshotCreatorData* data = new SnapshotCreatorData(isolate);
    data->isolate_ = isolate;
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    internal_isolate->set_array_buffer_allocator(&data->allocator_);
    internal_isolate->set_api_external_references(external_references);
    internal_isolate->enable_serializer();
    isolate->Enter();
    const StartupData* blob = existing_snapshot
        ? existing_snapshot
        : i::Snapshot::DefaultSnapshotBlob();
    if (blob && blob->raw_size > 0) {
        internal_isolate->set_snapshot_blob(blob);
        i::Snapshot::Initialize(internal_isolate);
    } else {
        internal_isolate->InitWithoutSnapshot();
    }
    data_ = data;
}

SnapshotCreator::SnapshotCreator(const intptr_t* external_references,
    StartupData* existing_snapshot)
    : SnapshotCreator(Isolate::Allocate(), external_references,
        existing_snapshot)
{
}

SnapshotCreator::~SnapshotCreator()
{
    SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
    DCHECK(data->created_);
    Isolate* isolate = data->isolate_;
    isolate->Exit();
    isolate->Dispose();
    delete data;
}

Isolate* SnapshotCreator::GetIsolate()
{
    return SnapshotCreatorData::cast(data_)->isolate_;
}

void SnapshotCreator::SetDefaultContext(
    Local<Context> context, SerializeInternalFieldsCallback callback)
{
    DCHECK(!context.IsEmpty());
    SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
    DCHECK(!data->created_);
    DCHECK(data->default_context_.IsEmpty());
    Isolate* isolate = data->isolate_;
    CHECK_EQ(isolate, context->GetIsolate());
    data->default_context_.Reset(isolate, context);
    data->default_embedder_fields_serializer_ = callback;
}

size_t SnapshotCreator::AddContext(Local<Context> context,
    SerializeInternalFieldsCallback callback)
{
    DCHECK(!context.IsEmpty());
    SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
    DCHECK(!data->created_);
    Isolate* isolate = data->isolate_;
    CHECK_EQ(isolate, context->GetIsolate());
    size_t index = data->contexts_.Size();
    data->contexts_.Append(context);
    data->embedder_fields_serializers_.push_back(callback);
    return index;
}

size_t SnapshotCreator::AddTemplate(Local<Template> template_obj)
{
    return AddData(template_obj);
}

size_t SnapshotCreator::AddData(i::Address object)
{
    DCHECK_NE(object, i::kNullAddress);
    SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
    DCHECK(!data->created_);
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(data->isolate_);
    i::HandleScope scope(isolate);
    i::Handle<i::Object> obj(i::Object(object), isolate);
    i::Handle<i::ArrayList> list;
    if (!isolate->heap()->serialized_objects()->IsArrayList()) {
        list = i::ArrayList::New(isolate, 1);
    } else {
        list = i::Handle<i::ArrayList>(
            i::ArrayList::cast(isolate->heap()->serialized_objects()), isolate);
    }
    size_t index = static_cast<size_t>(list->Length());
    list = i::ArrayList::Add(isolate, list, obj);
    isolate->heap()->SetSerializedObjects(*list);
    return index;
}

size_t SnapshotCreator::AddData(Local<Context> context, i::Address object)
{
    DCHECK_NE(object, i::kNullAddress);
    DCHECK(!SnapshotCreatorData::cast(data_)->created_);
    i::Handle<i::Context> ctx = Utils::OpenHandle(*context);
    i::Isolate* isolate = ctx->GetIsolate();
    i::HandleScope scope(isolate);
    i::Handle<i::Object> obj(i::Object(object), isolate);
    i::Handle<i::ArrayList> list;
    if (!ctx->serialized_objects()->IsArrayList()) {
        list = i::ArrayList::New(isolate, 1);
    } else {
        list = i::Handle<i::ArrayList>(
            i::ArrayList::cast(ctx->serialized_objects()), isolate);
    }
    size_t index = static_cast<size_t>(list->Length());
    list = i::ArrayList::Add(isolate, list, obj);
    ctx->set_serialized_objects(*list);
    return index;
}

namespace {
    void ConvertSerializedObjectsToFixedArray(Local<Context> context)
    {
        i::Handle<i::Context> ctx = Utils::OpenHandle(*context);
        i::Isolate* isolate = ctx->GetIsolate();
        if (!ctx->serialized_objects()->IsArrayList()) {
            ctx->set_serialized_objects(i::ReadOnlyRoots(isolate).empty_fixed_array());
        } else {
            i::Handle<i::ArrayList> list(i::ArrayList::cast(ctx->serialized_objects()),
                isolate);
            i::Handle<i::FixedArray> elements = i::ArrayList::Elements(isolate, list);
            ctx->set_serialized_objects(*elements);
        }
    }

    void ConvertSerializedObjectsToFixedArray(i::Isolate* isolate)
    {
        if (!isolate->heap()->serialized_objects()->IsArrayList()) {
            isolate->heap()->SetSerializedObjects(
                i::ReadOnlyRoots(isolate).empty_fixed_array());
        } else {
            i::Handle<i::ArrayList> list(
                i::ArrayList::cast(isolate->heap()->serialized_objects()), isolate);
            i::Handle<i::FixedArray> elements = i::ArrayList::Elements(isolate, list);
            isolate->heap()->SetSerializedObjects(*elements);
        }
    }
} // anonymous namespace

StartupData SnapshotCreator::CreateBlob(
    SnapshotCreator::FunctionCodeHandling function_code_handling)
{
    SnapshotCreatorData* data = SnapshotCreatorData::cast(data_);
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(data->isolate_);
    DCHECK(!data->created_);
    DCHECK(!data->default_context_.IsEmpty());

    int num_additional_contexts = static_cast<int>(data->contexts_.Size());

    {
        i::HandleScope scope(isolate);
        // Convert list of context-independent data to FixedArray.
        ConvertSerializedObjectsToFixedArray(isolate);

        // Convert lists of context-dependent data to FixedArray.
        ConvertSerializedObjectsToFixedArray(
            data->default_context_.Get(data->isolate_));
        for (int i = 0; i < num_additional_contexts; i++) {
            ConvertSerializedObjectsToFixedArray(data->contexts_.Get(i));
        }

        // We need to store the global proxy size upfront in case we need the
        // bootstrapper to create a global proxy before we deserialize the context.
        i::Handle<i::FixedArray> global_proxy_sizes = isolate->factory()->NewFixedArray(num_additional_contexts,
            i::AllocationType::kOld);
        for (int i = 0; i < num_additional_contexts; i++) {
            i::Handle<i::Context> context = v8::Utils::OpenHandle(*data->contexts_.Get(i));
            global_proxy_sizes->set(i,
                i::Smi::FromInt(context->global_proxy()->Size()));
        }
        isolate->heap()->SetSerializedGlobalProxySizes(*global_proxy_sizes);
    }

    // We might rehash strings and re-sort descriptors. Clear the lookup cache.
    isolate->descriptor_lookup_cache()->Clear();

    // If we don't do this then we end up with a stray root pointing at the
    // context even after we have disposed of the context.
    isolate->heap()->CollectAllAvailableGarbage(
        i::GarbageCollectionReason::kSnapshotCreator);
    {
        i::HandleScope scope(isolate);
        isolate->heap()->CompactWeakArrayLists(internal::AllocationType::kOld);
    }

    isolate->heap()->read_only_space()->ClearStringPaddingIfNeeded();

    if (function_code_handling == FunctionCodeHandling::kClear) {
        // Clear out re-compilable data from all shared function infos. Any
        // JSFunctions using these SFIs will have their code pointers reset by the
        // partial serializer.
        //
        // We have to iterate the heap and collect handles to each clearable SFI,
        // before we disable allocation, since we have to allocate UncompiledDatas
        // to be able to recompile them.
        //
        // Compiled irregexp code is also flushed by collecting and clearing any
        // seen JSRegExp objects.
        i::HandleScope scope(isolate);
        std::vector<i::Handle<i::SharedFunctionInfo>> sfis_to_clear;

        { // Heap allocation is disallowed within this scope.
            i::HeapIterator heap_iterator(isolate->heap());
            for (i::HeapObject current_obj = heap_iterator.next();
                 !current_obj.is_null(); current_obj = heap_iterator.next()) {
                if (current_obj->IsSharedFunctionInfo()) {
                    i::SharedFunctionInfo shared = i::SharedFunctionInfo::cast(current_obj);
                    if (shared->CanDiscardCompiled()) {
                        sfis_to_clear.emplace_back(shared, isolate);
                    }
                } else if (current_obj->IsJSRegExp()) {
                    i::JSRegExp regexp = i::JSRegExp::cast(current_obj);
                    if (regexp->HasCompiledCode()) {
                        regexp->DiscardCompiledCodeForSerialization();
                    }
                }
            }
        }

        // Must happen after heap iteration since SFI::DiscardCompiled may allocate.
        for (i::Handle<i::SharedFunctionInfo> shared : sfis_to_clear) {
            i::SharedFunctionInfo::DiscardCompiled(isolate, shared);
        }
    }

    i::DisallowHeapAllocation no_gc_from_here_on;

    int num_contexts = num_additional_contexts + 1;
    std::vector<i::Context> contexts;
    contexts.reserve(num_contexts);
    {
        i::HandleScope scope(isolate);
        contexts.push_back(
            *v8::Utils::OpenHandle(*data->default_context_.Get(data->isolate_)));
        data->default_context_.Reset();
        for (int i = 0; i < num_additional_contexts; i++) {
            i::Handle<i::Context> context = v8::Utils::OpenHandle(*data->contexts_.Get(i));
            contexts.push_back(*context);
        }
        data->contexts_.Clear();
    }

    // Check that values referenced by global/eternal handles are accounted for.
    i::SerializedHandleChecker handle_checker(isolate, &contexts);
    CHECK(handle_checker.CheckGlobalAndEternalHandles());

    i::HeapIterator heap_iterator(isolate->heap());
    for (i::HeapObject current_obj = heap_iterator.next(); !current_obj.is_null();
         current_obj = heap_iterator.next()) {
        if (current_obj->IsJSFunction()) {
            i::JSFunction fun = i::JSFunction::cast(current_obj);

            // Complete in-object slack tracking for all functions.
            fun->CompleteInobjectSlackTrackingIfActive();

            // Also, clear out feedback vectors, or any optimized code.
            if (!fun->raw_feedback_cell()->value()->IsUndefined()) {
                fun->raw_feedback_cell()->set_value(
                    i::ReadOnlyRoots(isolate).undefined_value());
                fun->set_code(isolate->builtins()->builtin(i::Builtins::kCompileLazy));
            }
            if (function_code_handling == FunctionCodeHandling::kClear) {
                DCHECK(fun->shared()->HasWasmExportedFunctionData() || fun->shared()->HasBuiltinId() || fun->shared()->IsApiFunction() || fun->shared()->HasUncompiledDataWithoutPreparseData());
            }
        }
    }

    i::ReadOnlySerializer read_only_serializer(isolate);
    read_only_serializer.SerializeReadOnlyRoots();

    i::StartupSerializer startup_serializer(isolate, &read_only_serializer);
    startup_serializer.SerializeStrongReferences();

    // Serialize each context with a new partial serializer.
    std::vector<i::SnapshotData*> context_snapshots;
    context_snapshots.reserve(num_contexts);

    // TODO(6593): generalize rehashing, and remove this flag.
    bool can_be_rehashed = true;

    for (int i = 0; i < num_contexts; i++) {
        bool is_default_context = i == 0;
        i::PartialSerializer partial_serializer(
            isolate, &startup_serializer,
            is_default_context ? data->default_embedder_fields_serializer_
                               : data->embedder_fields_serializers_[i - 1]);
        partial_serializer.Serialize(&contexts[i], !is_default_context);
        can_be_rehashed = can_be_rehashed && partial_serializer.can_be_rehashed();
        context_snapshots.push_back(new i::SnapshotData(&partial_serializer));
    }

    startup_serializer.SerializeWeakReferencesAndDeferred();
    can_be_rehashed = can_be_rehashed && startup_serializer.can_be_rehashed();

    read_only_serializer.FinalizeSerialization();
    can_be_rehashed = can_be_rehashed && read_only_serializer.can_be_rehashed();

    i::SnapshotData read_only_snapshot(&read_only_serializer);
    i::SnapshotData startup_snapshot(&startup_serializer);
    StartupData result = i::Snapshot::CreateSnapshotBlob(&startup_snapshot, &read_only_snapshot,
        context_snapshots, can_be_rehashed);

    // Delete heap-allocated context snapshot instances.
    for (const auto context_snapshot : context_snapshots) {
        delete context_snapshot;
    }
    data->created_ = true;

    DCHECK(i::Snapshot::VerifyChecksum(&result));
    return result;
}

void V8::SetDcheckErrorHandler(DcheckErrorCallback that)
{
    v8::base::SetDcheckFunction(that);
}

void V8::SetFlagsFromString(const char* str, int length)
{
    i::FlagList::SetFlagsFromString(str, length);
    i::FlagList::EnforceFlagImplications();
}

void V8::SetFlagsFromCommandLine(int* argc, char** argv, bool remove_flags)
{
    i::FlagList::SetFlagsFromCommandLine(argc, argv, remove_flags);
}

RegisteredExtension* RegisteredExtension::first_extension_ = nullptr;

RegisteredExtension::RegisteredExtension(std::unique_ptr<Extension> extension)
    : extension_(std::move(extension))
{
}

// static
void RegisteredExtension::Register(std::unique_ptr<Extension> extension)
{
    RegisteredExtension* new_extension = new RegisteredExtension(std::move(extension));
    new_extension->next_ = first_extension_;
    first_extension_ = new_extension;
}

// static
void RegisteredExtension::UnregisterAll()
{
    RegisteredExtension* re = first_extension_;
    while (re != nullptr) {
        RegisteredExtension* next = re->next();
        delete re;
        re = next;
    }
    first_extension_ = nullptr;
}

namespace {
    class ExtensionResource : public String::ExternalOneByteStringResource {
    public:
        ExtensionResource()
            : data_(nullptr)
            , length_(0)
        {
        }
        ExtensionResource(const char* data, size_t length)
            : data_(data)
            , length_(length)
        {
        }
        const char* data() const override { return data_; }
        size_t length() const override { return length_; }
        void Dispose() override { }

    private:
        const char* data_;
        size_t length_;
    };
} // anonymous namespace

void RegisterExtension(std::unique_ptr<Extension> extension)
{
    RegisteredExtension::Register(std::move(extension));
}

Extension::Extension(const char* name,
    const char* source,
    int dep_count,
    const char** deps,
    int source_length)
    : name_(name)
    , source_length_(source_length >= 0 ? source_length : (source ? static_cast<int>(strlen(source)) : 0))
    , dep_count_(dep_count)
    , deps_(deps)
    , auto_enable_(false)
{
    source_ = new ExtensionResource(source, source_length_);
    CHECK(source != nullptr || source_length_ == 0);
}

ResourceConstraints::ResourceConstraints()
    : max_semi_space_size_in_kb_(0)
    , max_old_space_size_(0)
    , stack_limit_(nullptr)
    , code_range_size_(0)
    , max_zone_pool_size_(0)
{
}

void ResourceConstraints::ConfigureDefaults(uint64_t physical_memory,
    uint64_t virtual_memory_limit)
{
    set_max_semi_space_size_in_kb(
        i::Heap::ComputeMaxSemiSpaceSize(physical_memory));
    set_max_old_space_size(i::Heap::ComputeMaxOldGenerationSize(physical_memory));

    if (virtual_memory_limit > 0 && i::kRequiresCodeRange) {
        // Reserve no more than 1/8 of the memory for the code range, but at most
        // kMaximalCodeRangeSize.
        set_code_range_size(
            i::Min(i::kMaximalCodeRangeSize / i::MB,
                static_cast<size_t>((virtual_memory_limit >> 3) / i::MB)));
    }
}

void SetResourceConstraints(i::Isolate* isolate,
    const ResourceConstraints& constraints)
{
    size_t semi_space_size = constraints.max_semi_space_size_in_kb();
    size_t old_space_size = constraints.max_old_space_size();
    size_t code_range_size = constraints.code_range_size();
    if (semi_space_size != 0 || old_space_size != 0 || code_range_size != 0) {
        isolate->heap()->ConfigureHeap(semi_space_size, old_space_size,
            code_range_size);
    }

    if (constraints.stack_limit() != nullptr) {
        uintptr_t limit = reinterpret_cast<uintptr_t>(constraints.stack_limit());
        isolate->stack_guard()->SetStackLimit(limit);
    }
}

i::Address* V8::GlobalizeReference(i::Isolate* isolate, i::Address* obj)
{
    LOG_API(isolate, Persistent, New);
    i::Handle<i::Object> result = isolate->global_handles()->Create(*obj);
#ifdef VERIFY_HEAP
    if (i::FLAG_verify_heap) {
        i::Object(*obj)->ObjectVerify(isolate);
    }
#endif // VERIFY_HEAP
    return result.location();
}

i::Address* V8::GlobalizeTracedReference(i::Isolate* isolate, i::Address* obj,
    internal::Address* slot)
{
    LOG_API(isolate, TracedGlobal, New);
    i::Handle<i::Object> result = isolate->global_handles()->CreateTraced(*obj, slot);
#ifdef VERIFY_HEAP
    if (i::FLAG_verify_heap) {
        i::Object(*obj)->ObjectVerify(isolate);
    }
#endif // VERIFY_HEAP
    return result.location();
}

i::Address* V8::CopyGlobalReference(i::Address* from)
{
    i::Handle<i::Object> result = i::GlobalHandles::CopyGlobal(from);
    return result.location();
}

void V8::MoveGlobalReference(internal::Address** from, internal::Address** to)
{
    i::GlobalHandles::MoveGlobal(from, to);
}

void V8::MoveTracedGlobalReference(internal::Address** from,
    internal::Address** to)
{
    i::GlobalHandles::MoveTracedGlobal(from, to);
}

void V8::RegisterExternallyReferencedObject(i::Address* location,
    i::Isolate* isolate)
{
    isolate->heap()->RegisterExternallyReferencedObject(location);
}

void V8::MakeWeak(i::Address* location, void* parameter,
    WeakCallbackInfo<void>::Callback weak_callback,
    WeakCallbackType type)
{
    i::GlobalHandles::MakeWeak(location, parameter, weak_callback, type);
}

void V8::MakeWeak(i::Address** location_addr)
{
    i::GlobalHandles::MakeWeak(location_addr);
}

void* V8::ClearWeak(i::Address* location)
{
    return i::GlobalHandles::ClearWeakness(location);
}

void V8::AnnotateStrongRetainer(i::Address* location, const char* label)
{
    i::GlobalHandles::AnnotateStrongRetainer(location, label);
}

void V8::DisposeGlobal(i::Address* location)
{
    i::GlobalHandles::Destroy(location);
}

void V8::DisposeTracedGlobal(internal::Address* location)
{
    i::GlobalHandles::DestroyTraced(location);
}

void V8::SetFinalizationCallbackTraced(
    internal::Address* location, void* parameter,
    WeakCallbackInfo<void>::Callback callback)
{
    i::GlobalHandles::SetFinalizationCallbackForTraced(location, parameter,
        callback);
}

Value* V8::Eternalize(Isolate* v8_isolate, Value* value)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    i::Object object = *Utils::OpenHandle(value);
    int index = -1;
    isolate->eternal_handles()->Create(isolate, object, &index);
    return reinterpret_cast<Value*>(
        isolate->eternal_handles()->Get(index).location());
}

void V8::FromJustIsNothing()
{
    Utils::ApiCheck(false, "v8::FromJust", "Maybe value is Nothing.");
}

void V8::ToLocalEmpty()
{
    Utils::ApiCheck(false, "v8::ToLocalChecked", "Empty MaybeLocal.");
}

void V8::InternalFieldOutOfBounds(int index)
{
    Utils::ApiCheck(0 <= index && index < kInternalFieldsInWeakCallback,
        "WeakCallbackInfo::GetInternalField",
        "Internal field out of bounds.");
}

// --- H a n d l e s ---

HandleScope::HandleScope(Isolate* isolate)
{
    Initialize(isolate);
}

void HandleScope::Initialize(Isolate* isolate)
{
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    // We do not want to check the correct usage of the Locker class all over the
    // place, so we do it only here: Without a HandleScope, an embedder can do
    // almost nothing, so it is enough to check in this central place.
    // We make an exception if the serializer is enabled, which means that the
    // Isolate is exclusively used to create a snapshot.
    Utils::ApiCheck(
        !v8::Locker::IsActive() || internal_isolate->thread_manager()->IsLockedByCurrentThread() || internal_isolate->serializer_enabled(),
        "HandleScope::HandleScope",
        "Entering the V8 API without proper locking in place");
    i::HandleScopeData* current = internal_isolate->handle_scope_data();
    isolate_ = internal_isolate;
    prev_next_ = current->next;
    prev_limit_ = current->limit;
    current->level++;
}

HandleScope::~HandleScope()
{
    i::HandleScope::CloseScope(isolate_, prev_next_, prev_limit_);
}

void* HandleScope::operator new(size_t) { base::OS::Abort(); }
void* HandleScope::operator new[](size_t) { base::OS::Abort(); }
void HandleScope::operator delete(void*, size_t) { base::OS::Abort(); }
void HandleScope::operator delete[](void*, size_t) { base::OS::Abort(); }

int HandleScope::NumberOfHandles(Isolate* isolate)
{
    return i::HandleScope::NumberOfHandles(
        reinterpret_cast<i::Isolate*>(isolate));
}

i::Address* HandleScope::CreateHandle(i::Isolate* isolate, i::Address value)
{
    return i::HandleScope::CreateHandle(isolate, value);
}

EscapableHandleScope::EscapableHandleScope(Isolate* v8_isolate)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    escape_slot_ = CreateHandle(isolate, i::ReadOnlyRoots(isolate).the_hole_value()->ptr());
    Initialize(v8_isolate);
}

i::Address* EscapableHandleScope::Escape(i::Address* escape_value)
{
    i::Heap* heap = reinterpret_cast<i::Isolate*>(GetIsolate())->heap();
    Utils::ApiCheck(i::Object(*escape_slot_)->IsTheHole(heap->isolate()),
        "EscapableHandleScope::Escape", "Escape value set twice");
    if (escape_value == nullptr) {
        *escape_slot_ = i::ReadOnlyRoots(heap).undefined_value()->ptr();
        return nullptr;
    }
    *escape_slot_ = *escape_value;
    return escape_slot_;
}

void* EscapableHandleScope::operator new(size_t) { base::OS::Abort(); }
void* EscapableHandleScope::operator new[](size_t) { base::OS::Abort(); }
void EscapableHandleScope::operator delete(void*, size_t) { base::OS::Abort(); }
void EscapableHandleScope::operator delete[](void*, size_t)
{
    base::OS::Abort();
}

SealHandleScope::SealHandleScope(Isolate* isolate)
    : isolate_(reinterpret_cast<i::Isolate*>(isolate))
{
    i::HandleScopeData* current = isolate_->handle_scope_data();
    prev_limit_ = current->limit;
    current->limit = current->next;
    prev_sealed_level_ = current->sealed_level;
    current->sealed_level = current->level;
}

SealHandleScope::~SealHandleScope()
{
    i::HandleScopeData* current = isolate_->handle_scope_data();
    DCHECK_EQ(current->next, current->limit);
    current->limit = prev_limit_;
    DCHECK_EQ(current->level, current->sealed_level);
    current->sealed_level = prev_sealed_level_;
}

void* SealHandleScope::operator new(size_t) { base::OS::Abort(); }
void* SealHandleScope::operator new[](size_t) { base::OS::Abort(); }
void SealHandleScope::operator delete(void*, size_t) { base::OS::Abort(); }
void SealHandleScope::operator delete[](void*, size_t) { base::OS::Abort(); }

void Context::Enter()
{
    i::Handle<i::Context> env = Utils::OpenHandle(this);
    i::Isolate* isolate = env->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScopeImplementer* impl = isolate->handle_scope_implementer();
    impl->EnterContext(*env);
    impl->SaveContext(isolate->context());
    isolate->set_context(*env);
}

void Context::Exit()
{
    i::Handle<i::Context> env = Utils::OpenHandle(this);
    i::Isolate* isolate = env->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScopeImplementer* impl = isolate->handle_scope_implementer();
    if (!Utils::ApiCheck(impl->LastEnteredContextWas(*env), "v8::Context::Exit()",
            "Cannot exit non-entered context")) {
        return;
    }
    impl->LeaveContext();
    isolate->set_context(impl->RestoreContext());
}

Context::BackupIncumbentScope::BackupIncumbentScope(
    Local<Context> backup_incumbent_context)
    : backup_incumbent_context_(backup_incumbent_context)
{
    DCHECK(!backup_incumbent_context_.IsEmpty());

    i::Handle<i::Context> env = Utils::OpenHandle(*backup_incumbent_context_);
    i::Isolate* isolate = env->GetIsolate();

    js_stack_comparable_address_ = i::SimulatorStack::RegisterJSStackComparableAddress(isolate);

    prev_ = isolate->top_backup_incumbent_scope();
    isolate->set_top_backup_incumbent_scope(this);
}

Context::BackupIncumbentScope::~BackupIncumbentScope()
{
    i::Handle<i::Context> env = Utils::OpenHandle(*backup_incumbent_context_);
    i::Isolate* isolate = env->GetIsolate();

    i::SimulatorStack::UnregisterJSStackComparableAddress(isolate);

    isolate->set_top_backup_incumbent_scope(prev_);
}

STATIC_ASSERT(i::Internals::kEmbedderDataSlotSize == i::kEmbedderDataSlotSize);

static i::Handle<i::EmbedderDataArray> EmbedderDataFor(Context* context,
    int index, bool can_grow,
    const char* location)
{
    i::Handle<i::Context> env = Utils::OpenHandle(context);
    i::Isolate* isolate = env->GetIsolate();
    bool ok = Utils::ApiCheck(env->IsNativeContext(),
                  location,
                  "Not a native context")
        && Utils::ApiCheck(index >= 0, location, "Negative index");
    if (!ok)
        return i::Handle<i::EmbedderDataArray>();
    // TODO(ishell): remove cast once embedder_data slot has a proper type.
    i::Handle<i::EmbedderDataArray> data(
        i::EmbedderDataArray::cast(env->embedder_data()), isolate);
    if (index < data->length())
        return data;
    if (!Utils::ApiCheck(can_grow && index < i::EmbedderDataArray::kMaxLength,
            location, "Index too large")) {
        return i::Handle<i::EmbedderDataArray>();
    }
    data = i::EmbedderDataArray::EnsureCapacity(isolate, data, index);
    env->set_embedder_data(*data);
    return data;
}

uint32_t Context::GetNumberOfEmbedderDataFields()
{
    i::Handle<i::Context> context = Utils::OpenHandle(this);
    CHECK(context->IsNativeContext());
    // TODO(ishell): remove cast once embedder_data slot has a proper type.
    return static_cast<uint32_t>(
        i::EmbedderDataArray::cast(context->embedder_data())->length());
}

v8::Local<v8::Value> Context::SlowGetEmbedderData(int index)
{
    const char* location = "v8::Context::GetEmbedderData()";
    i::Handle<i::EmbedderDataArray> data = EmbedderDataFor(this, index, false, location);
    if (data.is_null())
        return Local<Value>();
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    i::Handle<i::Object> result(i::EmbedderDataSlot(*data, index).load_tagged(),
        isolate);
    return Utils::ToLocal(result);
}

void Context::SetEmbedderData(int index, v8::Local<Value> value)
{
    const char* location = "v8::Context::SetEmbedderData()";
    i::Handle<i::EmbedderDataArray> data = EmbedderDataFor(this, index, true, location);
    if (data.is_null())
        return;
    i::Handle<i::Object> val = Utils::OpenHandle(*value);
    i::EmbedderDataSlot::store_tagged(*data, index, *val);
    DCHECK_EQ(*Utils::OpenHandle(*value),
        *Utils::OpenHandle(*GetEmbedderData(index)));
}

void* Context::SlowGetAlignedPointerFromEmbedderData(int index)
{
    const char* location = "v8::Context::GetAlignedPointerFromEmbedderData()";
    i::Handle<i::EmbedderDataArray> data = EmbedderDataFor(this, index, false, location);
    if (data.is_null())
        return nullptr;
    void* result;
    Utils::ApiCheck(i::EmbedderDataSlot(*data, index).ToAlignedPointer(&result),
        location, "Pointer is not aligned");
    return result;
}

void Context::SetAlignedPointerInEmbedderData(int index, void* value)
{
    const char* location = "v8::Context::SetAlignedPointerInEmbedderData()";
    i::Handle<i::EmbedderDataArray> data = EmbedderDataFor(this, index, true, location);
    bool ok = i::EmbedderDataSlot(*data, index).store_aligned_pointer(value);
    Utils::ApiCheck(ok, location, "Pointer is not aligned");
    DCHECK_EQ(value, GetAlignedPointerFromEmbedderData(index));
}

// --- T e m p l a t e ---

static void InitializeTemplate(i::Handle<i::TemplateInfo> that, int type)
{
    that->set_number_of_properties(0);
    that->set_tag(i::Smi::FromInt(type));
}

void Template::Set(v8::Local<Name> name, v8::Local<Data> value,
    v8::PropertyAttribute attribute)
{
    auto templ = Utils::OpenHandle(this);
    i::Isolate* isolate = templ->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    auto value_obj = Utils::OpenHandle(*value);
    CHECK(!value_obj->IsJSReceiver() || value_obj->IsTemplateInfo());
    if (value_obj->IsObjectTemplateInfo()) {
        templ->set_serial_number(i::Smi::kZero);
        if (templ->IsFunctionTemplateInfo()) {
            i::Handle<i::FunctionTemplateInfo>::cast(templ)->set_do_not_cache(true);
        }
    }
    i::ApiNatives::AddDataProperty(isolate, templ, Utils::OpenHandle(*name),
        value_obj,
        static_cast<i::PropertyAttributes>(attribute));
}

void Template::SetPrivate(v8::Local<Private> name, v8::Local<Data> value,
    v8::PropertyAttribute attribute)
{
    Set(Utils::ToLocal(Utils::OpenHandle(reinterpret_cast<Name*>(*name))), value,
        attribute);
}

void Template::SetAccessorProperty(
    v8::Local<v8::Name> name,
    v8::Local<FunctionTemplate> getter,
    v8::Local<FunctionTemplate> setter,
    v8::PropertyAttribute attribute,
    v8::AccessControl access_control)
{
    // TODO(verwaest): Remove |access_control|.
    DCHECK_EQ(v8::DEFAULT, access_control);
    auto templ = Utils::OpenHandle(this);
    auto isolate = templ->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    DCHECK(!name.IsEmpty());
    DCHECK(!getter.IsEmpty() || !setter.IsEmpty());
    i::HandleScope scope(isolate);
    i::ApiNatives::AddAccessorProperty(
        isolate, templ, Utils::OpenHandle(*name),
        Utils::OpenHandle(*getter, true), Utils::OpenHandle(*setter, true),
        static_cast<i::PropertyAttributes>(attribute));
}

// --- F u n c t i o n   T e m p l a t e ---
static void InitializeFunctionTemplate(
    i::Handle<i::FunctionTemplateInfo> info)
{
    InitializeTemplate(info, Consts::FUNCTION_TEMPLATE);
    info->set_flag(0);
}

static Local<ObjectTemplate> ObjectTemplateNew(
    i::Isolate* isolate, v8::Local<FunctionTemplate> constructor,
    bool do_not_cache);

Local<ObjectTemplate> FunctionTemplate::PrototypeTemplate()
{
    i::Isolate* i_isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::Object> result(Utils::OpenHandle(this)->GetPrototypeTemplate(),
        i_isolate);
    if (result->IsUndefined(i_isolate)) {
        // Do not cache prototype objects.
        result = Utils::OpenHandle(
            *ObjectTemplateNew(i_isolate, Local<FunctionTemplate>(), true));
        i::FunctionTemplateInfo::SetPrototypeTemplate(
            i_isolate, Utils::OpenHandle(this), result);
    }
    return ToApiHandle<ObjectTemplate>(result);
}

void FunctionTemplate::SetPrototypeProviderTemplate(
    Local<FunctionTemplate> prototype_provider)
{
    i::Isolate* i_isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::Object> result = Utils::OpenHandle(*prototype_provider);
    auto info = Utils::OpenHandle(this);
    CHECK(info->GetPrototypeTemplate()->IsUndefined(i_isolate));
    CHECK(info->GetParentTemplate()->IsUndefined(i_isolate));
    i::FunctionTemplateInfo::SetPrototypeProviderTemplate(i_isolate, info,
        result);
}

static void EnsureNotInstantiated(i::Handle<i::FunctionTemplateInfo> info,
    const char* func)
{
    Utils::ApiCheck(!info->instantiated(), func,
        "FunctionTemplate already instantiated");
}

void FunctionTemplate::Inherit(v8::Local<FunctionTemplate> value)
{
    auto info = Utils::OpenHandle(this);
    EnsureNotInstantiated(info, "v8::FunctionTemplate::Inherit");
    i::Isolate* i_isolate = info->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    CHECK(info->GetPrototypeProviderTemplate()->IsUndefined(i_isolate));
    i::FunctionTemplateInfo::SetParentTemplate(i_isolate, info,
        Utils::OpenHandle(*value));
}

static Local<FunctionTemplate> FunctionTemplateNew(
    i::Isolate* isolate, FunctionCallback callback, v8::Local<Value> data,
    v8::Local<Signature> signature, int length, bool do_not_cache,
    v8::Local<Private> cached_property_name = v8::Local<Private>(),
    SideEffectType side_effect_type = SideEffectType::kHasSideEffect)
{
    i::Handle<i::Struct> struct_obj = isolate->factory()->NewStruct(
        i::FUNCTION_TEMPLATE_INFO_TYPE, i::AllocationType::kOld);
    i::Handle<i::FunctionTemplateInfo> obj = i::Handle<i::FunctionTemplateInfo>::cast(struct_obj);
    InitializeFunctionTemplate(obj);
    obj->set_do_not_cache(do_not_cache);
    int next_serial_number = i::FunctionTemplateInfo::kInvalidSerialNumber;
    if (!do_not_cache) {
        next_serial_number = isolate->heap()->GetNextTemplateSerialNumber();
    }
    obj->set_serial_number(i::Smi::FromInt(next_serial_number));
    if (callback != nullptr) {
        Utils::ToLocal(obj)->SetCallHandler(callback, data, side_effect_type);
    }
    obj->set_length(length);
    obj->set_undetectable(false);
    obj->set_needs_access_check(false);
    obj->set_accept_any_receiver(true);
    if (!signature.IsEmpty()) {
        obj->set_signature(*Utils::OpenHandle(*signature));
    }
    obj->set_cached_property_name(
        cached_property_name.IsEmpty()
            ? i::ReadOnlyRoots(isolate).the_hole_value()
            : *Utils::OpenHandle(*cached_property_name));
    return Utils::ToLocal(obj);
}

Local<FunctionTemplate> FunctionTemplate::New(
    Isolate* isolate, FunctionCallback callback, v8::Local<Value> data,
    v8::Local<Signature> signature, int length, ConstructorBehavior behavior,
    SideEffectType side_effect_type)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    // Changes to the environment cannot be captured in the snapshot. Expect no
    // function templates when the isolate is created for serialization.
    LOG_API(i_isolate, FunctionTemplate, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    auto templ = FunctionTemplateNew(i_isolate, callback, data, signature, length,
        false, Local<Private>(), side_effect_type);
    if (behavior == ConstructorBehavior::kThrow)
        templ->RemovePrototype();
    return templ;
}

MaybeLocal<FunctionTemplate> FunctionTemplate::FromSnapshot(Isolate* isolate,
    size_t index)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::FixedArray serialized_objects = i_isolate->heap()->serialized_objects();
    int int_index = static_cast<int>(index);
    if (int_index < serialized_objects->length()) {
        i::Object info = serialized_objects->get(int_index);
        if (info->IsFunctionTemplateInfo()) {
            return Utils::ToLocal(i::Handle<i::FunctionTemplateInfo>(
                i::FunctionTemplateInfo::cast(info), i_isolate));
        }
    }
    return Local<FunctionTemplate>();
}

Local<FunctionTemplate> FunctionTemplate::NewWithCache(
    Isolate* isolate, FunctionCallback callback, Local<Private> cache_property,
    Local<Value> data, Local<Signature> signature, int length,
    SideEffectType side_effect_type)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, FunctionTemplate, NewWithCache);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    return FunctionTemplateNew(i_isolate, callback, data, signature, length,
        false, cache_property, side_effect_type);
}

Local<Signature> Signature::New(Isolate* isolate,
    Local<FunctionTemplate> receiver)
{
    return Utils::SignatureToLocal(Utils::OpenHandle(*receiver));
}

Local<AccessorSignature> AccessorSignature::New(
    Isolate* isolate, Local<FunctionTemplate> receiver)
{
    return Utils::AccessorSignatureToLocal(Utils::OpenHandle(*receiver));
}

#define SET_FIELD_WRAPPED(isolate, obj, setter, cdata)            \
    do {                                                          \
        i::Handle<i::Object> foreign = FromCData(isolate, cdata); \
        (obj)->setter(*foreign);                                  \
    } while (false)

void FunctionTemplate::SetCallHandler(FunctionCallback callback,
    v8::Local<Value> data,
    SideEffectType side_effect_type)
{
    auto info = Utils::OpenHandle(this);
    EnsureNotInstantiated(info, "v8::FunctionTemplate::SetCallHandler");
    i::Isolate* isolate = info->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    i::Handle<i::CallHandlerInfo> obj = isolate->factory()->NewCallHandlerInfo(
        side_effect_type == SideEffectType::kHasNoSideEffect);
    SET_FIELD_WRAPPED(isolate, obj, set_callback, callback);
    SET_FIELD_WRAPPED(isolate, obj, set_js_callback, obj->redirected_callback());
    if (data.IsEmpty()) {
        data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
    }
    obj->set_data(*Utils::OpenHandle(*data));
    info->set_call_code(*obj);
}

namespace {

    template <typename Getter, typename Setter>
    i::Handle<i::AccessorInfo> MakeAccessorInfo(
        i::Isolate* isolate, v8::Local<Name> name, Getter getter, Setter setter,
        v8::Local<Value> data, v8::AccessControl settings,
        v8::Local<AccessorSignature> signature, bool is_special_data_property,
        bool replace_on_access)
    {
        i::Handle<i::AccessorInfo> obj = isolate->factory()->NewAccessorInfo();
        SET_FIELD_WRAPPED(isolate, obj, set_getter, getter);
        DCHECK_IMPLIES(replace_on_access,
            is_special_data_property && setter == nullptr);
        if (is_special_data_property && setter == nullptr) {
            setter = reinterpret_cast<Setter>(&i::Accessors::ReconfigureToDataProperty);
        }
        SET_FIELD_WRAPPED(isolate, obj, set_setter, setter);
        i::Address redirected = obj->redirected_getter();
        if (redirected != i::kNullAddress) {
            SET_FIELD_WRAPPED(isolate, obj, set_js_getter, redirected);
        }
        if (data.IsEmpty()) {
            data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
        }
        obj->set_data(*Utils::OpenHandle(*data));
        obj->set_is_special_data_property(is_special_data_property);
        obj->set_replace_on_access(replace_on_access);
        i::Handle<i::Name> accessor_name = Utils::OpenHandle(*name);
        if (!accessor_name->IsUniqueName()) {
            accessor_name = isolate->factory()->InternalizeString(
                i::Handle<i::String>::cast(accessor_name));
        }
        obj->set_name(*accessor_name);
        if (settings & ALL_CAN_READ)
            obj->set_all_can_read(true);
        if (settings & ALL_CAN_WRITE)
            obj->set_all_can_write(true);
        obj->set_initial_property_attributes(i::NONE);
        if (!signature.IsEmpty()) {
            obj->set_expected_receiver_type(*Utils::OpenHandle(*signature));
        }
        return obj;
    }

} // namespace

Local<ObjectTemplate> FunctionTemplate::InstanceTemplate()
{
    i::Handle<i::FunctionTemplateInfo> handle = Utils::OpenHandle(this, true);
    if (!Utils::ApiCheck(!handle.is_null(),
            "v8::FunctionTemplate::InstanceTemplate()",
            "Reading from empty handle")) {
        return Local<ObjectTemplate>();
    }
    i::Isolate* isolate = handle->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    if (handle->GetInstanceTemplate()->IsUndefined(isolate)) {
        Local<ObjectTemplate> templ = ObjectTemplate::New(isolate, ToApiHandle<FunctionTemplate>(handle));
        i::FunctionTemplateInfo::SetInstanceTemplate(isolate, handle,
            Utils::OpenHandle(*templ));
    }
    i::Handle<i::ObjectTemplateInfo> result(
        i::ObjectTemplateInfo::cast(handle->GetInstanceTemplate()), isolate);
    return Utils::ToLocal(result);
}

void FunctionTemplate::SetLength(int length)
{
    auto info = Utils::OpenHandle(this);
    EnsureNotInstantiated(info, "v8::FunctionTemplate::SetLength");
    auto isolate = info->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    info->set_length(length);
}

void FunctionTemplate::SetClassName(Local<String> name)
{
    auto info = Utils::OpenHandle(this);
    EnsureNotInstantiated(info, "v8::FunctionTemplate::SetClassName");
    auto isolate = info->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    info->set_class_name(*Utils::OpenHandle(*name));
}

void FunctionTemplate::SetAcceptAnyReceiver(bool value)
{
    auto info = Utils::OpenHandle(this);
    EnsureNotInstantiated(info, "v8::FunctionTemplate::SetAcceptAnyReceiver");
    auto isolate = info->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    info->set_accept_any_receiver(value);
}

void FunctionTemplate::SetHiddenPrototype(bool value)
{
    auto info = Utils::OpenHandle(this);
    EnsureNotInstantiated(info, "v8::FunctionTemplate::SetHiddenPrototype");
    auto isolate = info->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    info->set_hidden_prototype(value);
}

void FunctionTemplate::ReadOnlyPrototype()
{
    auto info = Utils::OpenHandle(this);
    EnsureNotInstantiated(info, "v8::FunctionTemplate::ReadOnlyPrototype");
    auto isolate = info->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    info->set_read_only_prototype(true);
}

void FunctionTemplate::RemovePrototype()
{
    auto info = Utils::OpenHandle(this);
    EnsureNotInstantiated(info, "v8::FunctionTemplate::RemovePrototype");
    auto isolate = info->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    info->set_remove_prototype(true);
}

// --- O b j e c t T e m p l a t e ---

Local<ObjectTemplate> ObjectTemplate::New(
    Isolate* isolate, v8::Local<FunctionTemplate> constructor)
{
    return New(reinterpret_cast<i::Isolate*>(isolate), constructor);
}

static Local<ObjectTemplate> ObjectTemplateNew(
    i::Isolate* isolate, v8::Local<FunctionTemplate> constructor,
    bool do_not_cache)
{
    LOG_API(isolate, ObjectTemplate, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::Handle<i::Struct> struct_obj = isolate->factory()->NewStruct(
        i::OBJECT_TEMPLATE_INFO_TYPE, i::AllocationType::kOld);
    i::Handle<i::ObjectTemplateInfo> obj = i::Handle<i::ObjectTemplateInfo>::cast(struct_obj);
    InitializeTemplate(obj, Consts::OBJECT_TEMPLATE);
    int next_serial_number = 0;
    if (!do_not_cache) {
        next_serial_number = isolate->heap()->GetNextTemplateSerialNumber();
    }
    obj->set_serial_number(i::Smi::FromInt(next_serial_number));
    if (!constructor.IsEmpty())
        obj->set_constructor(*Utils::OpenHandle(*constructor));
    obj->set_data(i::Smi::kZero);
    return Utils::ToLocal(obj);
}

Local<ObjectTemplate> ObjectTemplate::New(
    i::Isolate* isolate, v8::Local<FunctionTemplate> constructor)
{
    return ObjectTemplateNew(isolate, constructor, false);
}

MaybeLocal<ObjectTemplate> ObjectTemplate::FromSnapshot(Isolate* isolate,
    size_t index)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::FixedArray serialized_objects = i_isolate->heap()->serialized_objects();
    int int_index = static_cast<int>(index);
    if (int_index < serialized_objects->length()) {
        i::Object info = serialized_objects->get(int_index);
        if (info->IsObjectTemplateInfo()) {
            return Utils::ToLocal(i::Handle<i::ObjectTemplateInfo>(
                i::ObjectTemplateInfo::cast(info), i_isolate));
        }
    }
    return Local<ObjectTemplate>();
}

// Ensure that the object template has a constructor.  If no
// constructor is available we create one.
static i::Handle<i::FunctionTemplateInfo> EnsureConstructor(
    i::Isolate* isolate,
    ObjectTemplate* object_template)
{
    i::Object obj = Utils::OpenHandle(object_template)->constructor();
    if (!obj->IsUndefined(isolate)) {
        i::FunctionTemplateInfo info = i::FunctionTemplateInfo::cast(obj);
        return i::Handle<i::FunctionTemplateInfo>(info, isolate);
    }
    Local<FunctionTemplate> templ = FunctionTemplate::New(reinterpret_cast<Isolate*>(isolate));
    i::Handle<i::FunctionTemplateInfo> constructor = Utils::OpenHandle(*templ);
    i::FunctionTemplateInfo::SetInstanceTemplate(
        isolate, constructor, Utils::OpenHandle(object_template));
    Utils::OpenHandle(object_template)->set_constructor(*constructor);
    return constructor;
}

template <typename Getter, typename Setter, typename Data, typename Template>
static void TemplateSetAccessor(
    Template* template_obj, v8::Local<Name> name, Getter getter, Setter setter,
    Data data, AccessControl settings, PropertyAttribute attribute,
    v8::Local<AccessorSignature> signature, bool is_special_data_property,
    bool replace_on_access, SideEffectType getter_side_effect_type,
    SideEffectType setter_side_effect_type)
{
    auto info = Utils::OpenHandle(template_obj);
    auto isolate = info->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    i::Handle<i::AccessorInfo> accessor_info = MakeAccessorInfo(isolate, name, getter, setter, data, settings, signature,
        is_special_data_property, replace_on_access);
    accessor_info->set_initial_property_attributes(
        static_cast<i::PropertyAttributes>(attribute));
    accessor_info->set_getter_side_effect_type(getter_side_effect_type);
    accessor_info->set_setter_side_effect_type(setter_side_effect_type);
    i::ApiNatives::AddNativeDataProperty(isolate, info, accessor_info);
}

void Template::SetNativeDataProperty(
    v8::Local<String> name, AccessorGetterCallback getter,
    AccessorSetterCallback setter, v8::Local<Value> data,
    PropertyAttribute attribute, v8::Local<AccessorSignature> signature,
    AccessControl settings, SideEffectType getter_side_effect_type,
    SideEffectType setter_side_effect_type)
{
    TemplateSetAccessor(this, name, getter, setter, data, settings, attribute,
        signature, true, false, getter_side_effect_type,
        setter_side_effect_type);
}

void Template::SetNativeDataProperty(
    v8::Local<Name> name, AccessorNameGetterCallback getter,
    AccessorNameSetterCallback setter, v8::Local<Value> data,
    PropertyAttribute attribute, v8::Local<AccessorSignature> signature,
    AccessControl settings, SideEffectType getter_side_effect_type,
    SideEffectType setter_side_effect_type)
{
    TemplateSetAccessor(this, name, getter, setter, data, settings, attribute,
        signature, true, false, getter_side_effect_type,
        setter_side_effect_type);
}

void Template::SetLazyDataProperty(v8::Local<Name> name,
    AccessorNameGetterCallback getter,
    v8::Local<Value> data,
    PropertyAttribute attribute,
    SideEffectType getter_side_effect_type,
    SideEffectType setter_side_effect_type)
{
    TemplateSetAccessor(this, name, getter,
        static_cast<AccessorNameSetterCallback>(nullptr), data,
        DEFAULT, attribute, Local<AccessorSignature>(), true,
        true, getter_side_effect_type, setter_side_effect_type);
}

void Template::SetIntrinsicDataProperty(Local<Name> name, Intrinsic intrinsic,
    PropertyAttribute attribute)
{
    auto templ = Utils::OpenHandle(this);
    i::Isolate* isolate = templ->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    i::ApiNatives::AddDataProperty(isolate, templ, Utils::OpenHandle(*name),
        intrinsic,
        static_cast<i::PropertyAttributes>(attribute));
}

void ObjectTemplate::SetAccessor(v8::Local<String> name,
    AccessorGetterCallback getter,
    AccessorSetterCallback setter,
    v8::Local<Value> data, AccessControl settings,
    PropertyAttribute attribute,
    v8::Local<AccessorSignature> signature,
    SideEffectType getter_side_effect_type,
    SideEffectType setter_side_effect_type)
{
    TemplateSetAccessor(this, name, getter, setter, data, settings, attribute,
        signature, i::FLAG_disable_old_api_accessors, false,
        getter_side_effect_type, setter_side_effect_type);
}

void ObjectTemplate::SetAccessor(v8::Local<Name> name,
    AccessorNameGetterCallback getter,
    AccessorNameSetterCallback setter,
    v8::Local<Value> data, AccessControl settings,
    PropertyAttribute attribute,
    v8::Local<AccessorSignature> signature,
    SideEffectType getter_side_effect_type,
    SideEffectType setter_side_effect_type)
{
    TemplateSetAccessor(this, name, getter, setter, data, settings, attribute,
        signature, i::FLAG_disable_old_api_accessors, false,
        getter_side_effect_type, setter_side_effect_type);
}

template <typename Getter, typename Setter, typename Query, typename Descriptor,
    typename Deleter, typename Enumerator, typename Definer>
static i::Handle<i::InterceptorInfo> CreateInterceptorInfo(
    i::Isolate* isolate, Getter getter, Setter setter, Query query,
    Descriptor descriptor, Deleter remover, Enumerator enumerator,
    Definer definer, Local<Value> data, PropertyHandlerFlags flags)
{
    auto obj = i::Handle<i::InterceptorInfo>::cast(isolate->factory()->NewStruct(
        i::INTERCEPTOR_INFO_TYPE, i::AllocationType::kOld));
    obj->set_flags(0);

    if (getter != nullptr)
        SET_FIELD_WRAPPED(isolate, obj, set_getter, getter);
    if (setter != nullptr)
        SET_FIELD_WRAPPED(isolate, obj, set_setter, setter);
    if (query != nullptr)
        SET_FIELD_WRAPPED(isolate, obj, set_query, query);
    if (descriptor != nullptr)
        SET_FIELD_WRAPPED(isolate, obj, set_descriptor, descriptor);
    if (remover != nullptr)
        SET_FIELD_WRAPPED(isolate, obj, set_deleter, remover);
    if (enumerator != nullptr)
        SET_FIELD_WRAPPED(isolate, obj, set_enumerator, enumerator);
    if (definer != nullptr)
        SET_FIELD_WRAPPED(isolate, obj, set_definer, definer);
    obj->set_can_intercept_symbols(
        !(static_cast<int>(flags) & static_cast<int>(PropertyHandlerFlags::kOnlyInterceptStrings)));
    obj->set_all_can_read(static_cast<int>(flags) & static_cast<int>(PropertyHandlerFlags::kAllCanRead));
    obj->set_non_masking(static_cast<int>(flags) & static_cast<int>(PropertyHandlerFlags::kNonMasking));
    obj->set_has_no_side_effect(
        static_cast<int>(flags) & static_cast<int>(PropertyHandlerFlags::kHasNoSideEffect));

    if (data.IsEmpty()) {
        data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
    }
    obj->set_data(*Utils::OpenHandle(*data));
    return obj;
}

template <typename Getter, typename Setter, typename Query, typename Descriptor,
    typename Deleter, typename Enumerator, typename Definer>
static i::Handle<i::InterceptorInfo> CreateNamedInterceptorInfo(
    i::Isolate* isolate, Getter getter, Setter setter, Query query,
    Descriptor descriptor, Deleter remover, Enumerator enumerator,
    Definer definer, Local<Value> data, PropertyHandlerFlags flags)
{
    auto interceptor = CreateInterceptorInfo(isolate, getter, setter, query, descriptor, remover,
        enumerator, definer, data, flags);
    interceptor->set_is_named(true);
    return interceptor;
}

template <typename Getter, typename Setter, typename Query, typename Descriptor,
    typename Deleter, typename Enumerator, typename Definer>
static i::Handle<i::InterceptorInfo> CreateIndexedInterceptorInfo(
    i::Isolate* isolate, Getter getter, Setter setter, Query query,
    Descriptor descriptor, Deleter remover, Enumerator enumerator,
    Definer definer, Local<Value> data, PropertyHandlerFlags flags)
{
    auto interceptor = CreateInterceptorInfo(isolate, getter, setter, query, descriptor, remover,
        enumerator, definer, data, flags);
    interceptor->set_is_named(false);
    return interceptor;
}

template <typename Getter, typename Setter, typename Query, typename Descriptor,
    typename Deleter, typename Enumerator, typename Definer>
static void ObjectTemplateSetNamedPropertyHandler(
    ObjectTemplate* templ, Getter getter, Setter setter, Query query,
    Descriptor descriptor, Deleter remover, Enumerator enumerator,
    Definer definer, Local<Value> data, PropertyHandlerFlags flags)
{
    i::Isolate* isolate = Utils::OpenHandle(templ)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    auto cons = EnsureConstructor(isolate, templ);
    EnsureNotInstantiated(cons, "ObjectTemplateSetNamedPropertyHandler");
    auto obj = CreateNamedInterceptorInfo(isolate, getter, setter, query, descriptor,
        remover, enumerator, definer, data, flags);
    i::FunctionTemplateInfo::SetNamedPropertyHandler(isolate, cons, obj);
}

void ObjectTemplate::SetHandler(
    const NamedPropertyHandlerConfiguration& config)
{
    ObjectTemplateSetNamedPropertyHandler(
        this, config.getter, config.setter, config.query, config.descriptor,
        config.deleter, config.enumerator, config.definer, config.data,
        config.flags);
}

void ObjectTemplate::MarkAsUndetectable()
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    auto cons = EnsureConstructor(isolate, this);
    EnsureNotInstantiated(cons, "v8::ObjectTemplate::MarkAsUndetectable");
    cons->set_undetectable(true);
}

void ObjectTemplate::SetAccessCheckCallback(AccessCheckCallback callback,
    Local<Value> data)
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    auto cons = EnsureConstructor(isolate, this);
    EnsureNotInstantiated(cons, "v8::ObjectTemplate::SetAccessCheckCallback");

    i::Handle<i::Struct> struct_info = isolate->factory()->NewStruct(
        i::ACCESS_CHECK_INFO_TYPE, i::AllocationType::kOld);
    i::Handle<i::AccessCheckInfo> info = i::Handle<i::AccessCheckInfo>::cast(struct_info);

    SET_FIELD_WRAPPED(isolate, info, set_callback, callback);
    info->set_named_interceptor(i::Object());
    info->set_indexed_interceptor(i::Object());

    if (data.IsEmpty()) {
        data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
    }
    info->set_data(*Utils::OpenHandle(*data));

    i::FunctionTemplateInfo::SetAccessCheckInfo(isolate, cons, info);
    cons->set_needs_access_check(true);
}

void ObjectTemplate::SetAccessCheckCallbackAndHandler(
    AccessCheckCallback callback,
    const NamedPropertyHandlerConfiguration& named_handler,
    const IndexedPropertyHandlerConfiguration& indexed_handler,
    Local<Value> data)
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    auto cons = EnsureConstructor(isolate, this);
    EnsureNotInstantiated(
        cons, "v8::ObjectTemplate::SetAccessCheckCallbackWithHandler");

    i::Handle<i::Struct> struct_info = isolate->factory()->NewStruct(
        i::ACCESS_CHECK_INFO_TYPE, i::AllocationType::kOld);
    i::Handle<i::AccessCheckInfo> info = i::Handle<i::AccessCheckInfo>::cast(struct_info);

    SET_FIELD_WRAPPED(isolate, info, set_callback, callback);
    auto named_interceptor = CreateNamedInterceptorInfo(
        isolate, named_handler.getter, named_handler.setter, named_handler.query,
        named_handler.descriptor, named_handler.deleter, named_handler.enumerator,
        named_handler.definer, named_handler.data, named_handler.flags);
    info->set_named_interceptor(*named_interceptor);
    auto indexed_interceptor = CreateIndexedInterceptorInfo(
        isolate, indexed_handler.getter, indexed_handler.setter,
        indexed_handler.query, indexed_handler.descriptor,
        indexed_handler.deleter, indexed_handler.enumerator,
        indexed_handler.definer, indexed_handler.data, indexed_handler.flags);
    info->set_indexed_interceptor(*indexed_interceptor);

    if (data.IsEmpty()) {
        data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
    }
    info->set_data(*Utils::OpenHandle(*data));

    i::FunctionTemplateInfo::SetAccessCheckInfo(isolate, cons, info);
    cons->set_needs_access_check(true);
}

void ObjectTemplate::SetHandler(
    const IndexedPropertyHandlerConfiguration& config)
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    auto cons = EnsureConstructor(isolate, this);
    EnsureNotInstantiated(cons, "v8::ObjectTemplate::SetHandler");
    auto obj = CreateIndexedInterceptorInfo(
        isolate, config.getter, config.setter, config.query, config.descriptor,
        config.deleter, config.enumerator, config.definer, config.data,
        config.flags);
    i::FunctionTemplateInfo::SetIndexedPropertyHandler(isolate, cons, obj);
}

void ObjectTemplate::SetCallAsFunctionHandler(FunctionCallback callback,
    Local<Value> data)
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    auto cons = EnsureConstructor(isolate, this);
    EnsureNotInstantiated(cons, "v8::ObjectTemplate::SetCallAsFunctionHandler");
    i::Handle<i::CallHandlerInfo> obj = isolate->factory()->NewCallHandlerInfo();
    SET_FIELD_WRAPPED(isolate, obj, set_callback, callback);
    SET_FIELD_WRAPPED(isolate, obj, set_js_callback, obj->redirected_callback());
    if (data.IsEmpty()) {
        data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
    }
    obj->set_data(*Utils::OpenHandle(*data));
    i::FunctionTemplateInfo::SetInstanceCallHandler(isolate, cons, obj);
}

int ObjectTemplate::InternalFieldCount()
{
    return Utils::OpenHandle(this)->embedder_field_count();
}

void ObjectTemplate::SetInternalFieldCount(int value)
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    if (!Utils::ApiCheck(i::Smi::IsValid(value),
            "v8::ObjectTemplate::SetInternalFieldCount()",
            "Invalid embedder field count")) {
        return;
    }
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    if (value > 0) {
        // The embedder field count is set by the constructor function's
        // construct code, so we ensure that there is a constructor
        // function to do the setting.
        EnsureConstructor(isolate, this);
    }
    Utils::OpenHandle(this)->set_embedder_field_count(value);
}

bool ObjectTemplate::IsImmutableProto()
{
    return Utils::OpenHandle(this)->immutable_proto();
}

void ObjectTemplate::SetImmutableProto()
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    Utils::OpenHandle(this)->set_immutable_proto(true);
}

// --- S c r i p t s ---

// Internally, UnboundScript is a SharedFunctionInfo, and Script is a
// JSFunction.

ScriptCompiler::CachedData::CachedData(const uint8_t* data_, int length_,
    BufferPolicy buffer_policy_)
    : data(data_)
    , length(length_)
    , rejected(false)
    , buffer_policy(buffer_policy_)
{
}

ScriptCompiler::CachedData::~CachedData()
{
    if (buffer_policy == BufferOwned) {
        delete[] data;
    }
}

bool ScriptCompiler::ExternalSourceStream::SetBookmark() { return false; }

void ScriptCompiler::ExternalSourceStream::ResetToBookmark() { UNREACHABLE(); }

ScriptCompiler::StreamedSource::StreamedSource(ExternalSourceStream* stream,
    Encoding encoding)
    : StreamedSource(std::unique_ptr<ExternalSourceStream>(stream), encoding)
{
}

ScriptCompiler::StreamedSource::StreamedSource(
    std::unique_ptr<ExternalSourceStream> stream, Encoding encoding)
    : impl_(new i::ScriptStreamingData(std::move(stream), encoding))
{
}

ScriptCompiler::StreamedSource::~StreamedSource() = default;

Local<Script> UnboundScript::BindToCurrentContext()
{
    auto function_info = i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
    i::Isolate* isolate = function_info->GetIsolate();
    i::Handle<i::JSFunction> function = isolate->factory()->NewFunctionFromSharedFunctionInfo(
        function_info, isolate->native_context());
    return ToApiHandle<Script>(function);
}

int UnboundScript::GetId()
{
    auto function_info = i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
    i::Isolate* isolate = function_info->GetIsolate();
    LOG_API(isolate, UnboundScript, GetId);
    i::HandleScope scope(isolate);
    i::Handle<i::Script> script(i::Script::cast(function_info->script()),
        isolate);
    return script->id();
}

int UnboundScript::GetLineNumber(int code_pos)
{
    i::Handle<i::SharedFunctionInfo> obj = i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
    i::Isolate* isolate = obj->GetIsolate();
    LOG_API(isolate, UnboundScript, GetLineNumber);
    if (obj->script()->IsScript()) {
        i::Handle<i::Script> script(i::Script::cast(obj->script()), isolate);
        return i::Script::GetLineNumber(script, code_pos);
    } else {
        return -1;
    }
}

Local<Value> UnboundScript::GetScriptName()
{
    i::Handle<i::SharedFunctionInfo> obj = i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
    i::Isolate* isolate = obj->GetIsolate();
    LOG_API(isolate, UnboundScript, GetName);
    if (obj->script()->IsScript()) {
        i::Object name = i::Script::cast(obj->script())->name();
        return Utils::ToLocal(i::Handle<i::Object>(name, isolate));
    } else {
        return Local<String>();
    }
}

Local<Value> UnboundScript::GetSourceURL()
{
    i::Handle<i::SharedFunctionInfo> obj = i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
    i::Isolate* isolate = obj->GetIsolate();
    LOG_API(isolate, UnboundScript, GetSourceURL);
    if (obj->script()->IsScript()) {
        i::Object url = i::Script::cast(obj->script())->source_url();
        return Utils::ToLocal(i::Handle<i::Object>(url, isolate));
    } else {
        return Local<String>();
    }
}

Local<Value> UnboundScript::GetSourceMappingURL()
{
    i::Handle<i::SharedFunctionInfo> obj = i::Handle<i::SharedFunctionInfo>::cast(Utils::OpenHandle(this));
    i::Isolate* isolate = obj->GetIsolate();
    LOG_API(isolate, UnboundScript, GetSourceMappingURL);
    if (obj->script()->IsScript()) {
        i::Object url = i::Script::cast(obj->script())->source_mapping_url();
        return Utils::ToLocal(i::Handle<i::Object>(url, isolate));
    } else {
        return Local<String>();
    }
}

MaybeLocal<Value> Script::Run(Local<Context> context)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.Execute");
    ENTER_V8(isolate, context, Script, Run, MaybeLocal<Value>(),
        InternalEscapableScope);
    i::HistogramTimerScope execute_timer(isolate->counters()->execute(), true);
    i::AggregatingHistogramTimerScope timer(isolate->counters()->compile_lazy());
    i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
    auto fun = i::Handle<i::JSFunction>::cast(Utils::OpenHandle(this));

    i::Handle<i::Object> receiver = isolate->global_proxy();
    Local<Value> result;
    has_pending_exception = !ToLocal<Value>(
        i::Execution::Call(isolate, fun, receiver, 0, nullptr), &result);

    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(result);
}

Local<Value> ScriptOrModule::GetResourceName()
{
    i::Handle<i::Script> obj = Utils::OpenHandle(this);
    i::Isolate* isolate = obj->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::Handle<i::Object> val(obj->name(), isolate);
    return ToApiHandle<Value>(val);
}

Local<PrimitiveArray> ScriptOrModule::GetHostDefinedOptions()
{
    i::Handle<i::Script> obj = Utils::OpenHandle(this);
    i::Isolate* isolate = obj->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::Handle<i::FixedArray> val(obj->host_defined_options(), isolate);
    return ToApiHandle<PrimitiveArray>(val);
}

Local<UnboundScript> Script::GetUnboundScript()
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::SharedFunctionInfo sfi = i::JSFunction::cast(*obj)->shared();
    i::Isolate* isolate = sfi->GetIsolate();
    return ToApiHandle<UnboundScript>(i::handle(sfi, isolate));
}

// static
Local<PrimitiveArray> PrimitiveArray::New(Isolate* v8_isolate, int length)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    Utils::ApiCheck(length >= 0, "v8::PrimitiveArray::New",
        "length must be equal or greater than zero");
    i::Handle<i::FixedArray> array = isolate->factory()->NewFixedArray(length);
    return ToApiHandle<PrimitiveArray>(array);
}

int PrimitiveArray::Length() const
{
    i::Handle<i::FixedArray> array = Utils::OpenHandle(this);
    return array->length();
}

void PrimitiveArray::Set(Isolate* v8_isolate, int index,
    Local<Primitive> item)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    i::Handle<i::FixedArray> array = Utils::OpenHandle(this);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    Utils::ApiCheck(index >= 0 && index < array->length(),
        "v8::PrimitiveArray::Set",
        "index must be greater than or equal to 0 and less than the "
        "array length");
    i::Handle<i::Object> i_item = Utils::OpenHandle(*item);
    array->set(index, *i_item);
}

Local<Primitive> PrimitiveArray::Get(Isolate* v8_isolate, int index)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    i::Handle<i::FixedArray> array = Utils::OpenHandle(this);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    Utils::ApiCheck(index >= 0 && index < array->length(),
        "v8::PrimitiveArray::Get",
        "index must be greater than or equal to 0 and less than the "
        "array length");
    i::Handle<i::Object> i_item(array->get(index), isolate);
    return ToApiHandle<Primitive>(i_item);
}

Module::Status Module::GetStatus() const
{
    i::Handle<i::Module> self = Utils::OpenHandle(this);
    switch (self->status()) {
    case i::Module::kUninstantiated:
    case i::Module::kPreInstantiating:
        return kUninstantiated;
    case i::Module::kInstantiating:
        return kInstantiating;
    case i::Module::kInstantiated:
        return kInstantiated;
    case i::Module::kEvaluating:
        return kEvaluating;
    case i::Module::kEvaluated:
        return kEvaluated;
    case i::Module::kErrored:
        return kErrored;
    }
    UNREACHABLE();
}

Local<Value> Module::GetException() const
{
    Utils::ApiCheck(GetStatus() == kErrored, "v8::Module::GetException",
        "Module status must be kErrored");
    i::Handle<i::Module> self = Utils::OpenHandle(this);
    i::Isolate* isolate = self->GetIsolate();
    return ToApiHandle<Value>(i::handle(self->GetException(), isolate));
}

int Module::GetModuleRequestsLength() const
{
    i::Handle<i::Module> self = Utils::OpenHandle(this);
    return self->info()->module_requests()->length();
}

Local<String> Module::GetModuleRequest(int i) const
{
    CHECK_GE(i, 0);
    i::Handle<i::Module> self = Utils::OpenHandle(this);
    i::Isolate* isolate = self->GetIsolate();
    i::Handle<i::FixedArray> module_requests(self->info()->module_requests(),
        isolate);
    CHECK_LT(i, module_requests->length());
    return ToApiHandle<String>(i::handle(module_requests->get(i), isolate));
}

Location Module::GetModuleRequestLocation(int i) const
{
    CHECK_GE(i, 0);
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    i::HandleScope scope(isolate);
    i::Handle<i::Module> self = Utils::OpenHandle(this);
    i::Handle<i::FixedArray> module_request_positions(
        self->info()->module_request_positions(), isolate);
    CHECK_LT(i, module_request_positions->length());
    int position = i::Smi::ToInt(module_request_positions->get(i));
    i::Handle<i::Script> script(self->script(), isolate);
    i::Script::PositionInfo info;
    i::Script::GetPositionInfo(script, position, &info, i::Script::WITH_OFFSET);
    return v8::Location(info.line, info.column);
}

Local<Value> Module::GetModuleNamespace()
{
    Utils::ApiCheck(
        GetStatus() >= kInstantiated, "v8::Module::GetModuleNamespace",
        "v8::Module::GetModuleNamespace must be used on an instantiated module");
    i::Handle<i::Module> self = Utils::OpenHandle(this);
    i::Handle<i::JSModuleNamespace> module_namespace = i::Module::GetModuleNamespace(self->GetIsolate(), self);
    return ToApiHandle<Value>(module_namespace);
}

Local<UnboundModuleScript> Module::GetUnboundModuleScript()
{
    Utils::ApiCheck(
        GetStatus() < kEvaluating, "v8::Module::GetUnboundScript",
        "v8::Module::GetUnboundScript must be used on an unevaluated module");
    i::Handle<i::Module> self = Utils::OpenHandle(this);
    return ToApiHandle<UnboundModuleScript>(i::Handle<i::SharedFunctionInfo>(
        self->GetSharedFunctionInfo(), self->GetIsolate()));
}

int Module::GetIdentityHash() const { return Utils::OpenHandle(this)->hash(); }

Maybe<bool> Module::InstantiateModule(Local<Context> context,
    Module::ResolveCallback callback)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Module, InstantiateModule, Nothing<bool>(),
        i::HandleScope);
    has_pending_exception = !i::Module::Instantiate(
        isolate, Utils::OpenHandle(this), context, callback);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(true);
}

MaybeLocal<Value> Module::Evaluate(Local<Context> context)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.Execute");
    ENTER_V8(isolate, context, Module, Evaluate, MaybeLocal<Value>(),
        InternalEscapableScope);
    i::HistogramTimerScope execute_timer(isolate->counters()->execute(), true);
    i::AggregatingHistogramTimerScope timer(isolate->counters()->compile_lazy());
    i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);

    i::Handle<i::Module> self = Utils::OpenHandle(this);
    // It's an API error to call Evaluate before Instantiate.
    CHECK_GE(self->status(), i::Module::kInstantiated);

    Local<Value> result;
    has_pending_exception = !ToLocal(i::Module::Evaluate(isolate, self), &result);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(result);
}

namespace {

    i::Compiler::ScriptDetails GetScriptDetails(
        i::Isolate* isolate, Local<Value> resource_name,
        Local<Integer> resource_line_offset, Local<Integer> resource_column_offset,
        Local<Value> source_map_url, Local<PrimitiveArray> host_defined_options)
    {
        i::Compiler::ScriptDetails script_details;
        if (!resource_name.IsEmpty()) {
            script_details.name_obj = Utils::OpenHandle(*(resource_name));
        }
        if (!resource_line_offset.IsEmpty()) {
            script_details.line_offset = static_cast<int>(resource_line_offset->Value());
        }
        if (!resource_column_offset.IsEmpty()) {
            script_details.column_offset = static_cast<int>(resource_column_offset->Value());
        }
        script_details.host_defined_options = isolate->factory()->empty_fixed_array();
        if (!host_defined_options.IsEmpty()) {
            script_details.host_defined_options = Utils::OpenHandle(*(host_defined_options));
        }
        if (!source_map_url.IsEmpty()) {
            script_details.source_map_url = Utils::OpenHandle(*(source_map_url));
        }
        return script_details;
    }

} // namespace

MaybeLocal<UnboundScript> ScriptCompiler::CompileUnboundInternal(
    Isolate* v8_isolate, Source* source, CompileOptions options,
    NoCacheReason no_cache_reason)
{
    auto isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.ScriptCompiler");
    ENTER_V8_NO_SCRIPT(isolate, v8_isolate->GetCurrentContext(), ScriptCompiler,
        CompileUnbound, MaybeLocal<UnboundScript>(),
        InternalEscapableScope);

    i::ScriptData* script_data = nullptr;
    if (options == kConsumeCodeCache) {
        DCHECK(source->cached_data);
        // ScriptData takes care of pointer-aligning the data.
        script_data = new i::ScriptData(source->cached_data->data,
            source->cached_data->length);
    }

    i::Handle<i::String> str = Utils::OpenHandle(*(source->source_string));
    i::Handle<i::SharedFunctionInfo> result;
    TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.CompileScript");
    i::Compiler::ScriptDetails script_details = GetScriptDetails(
        isolate, source->resource_name, source->resource_line_offset,
        source->resource_column_offset, source->source_map_url,
        source->host_defined_options);
    i::MaybeHandle<i::SharedFunctionInfo> maybe_function_info = i::Compiler::GetSharedFunctionInfoForScript(
        isolate, str, script_details, source->resource_options, nullptr,
        script_data, options, no_cache_reason, i::NOT_NATIVES_CODE);
    if (options == kConsumeCodeCache) {
        source->cached_data->rejected = script_data->rejected();
    }
    delete script_data;
    has_pending_exception = !maybe_function_info.ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION(UnboundScript);
    RETURN_ESCAPED(ToApiHandle<UnboundScript>(result));
}

MaybeLocal<UnboundScript> ScriptCompiler::CompileUnboundScript(
    Isolate* v8_isolate, Source* source, CompileOptions options,
    NoCacheReason no_cache_reason)
{
    Utils::ApiCheck(
        !source->GetResourceOptions().IsModule(),
        "v8::ScriptCompiler::CompileUnboundScript",
        "v8::ScriptCompiler::CompileModule must be used to compile modules");
    return CompileUnboundInternal(v8_isolate, source, options, no_cache_reason);
}

MaybeLocal<Script> ScriptCompiler::Compile(Local<Context> context,
    Source* source,
    CompileOptions options,
    NoCacheReason no_cache_reason)
{
    Utils::ApiCheck(
        !source->GetResourceOptions().IsModule(), "v8::ScriptCompiler::Compile",
        "v8::ScriptCompiler::CompileModule must be used to compile modules");
    auto isolate = context->GetIsolate();
    auto maybe = CompileUnboundInternal(isolate, source, options, no_cache_reason);
    Local<UnboundScript> result;
    if (!maybe.ToLocal(&result))
        return MaybeLocal<Script>();
    v8::Context::Scope scope(context);
    return result->BindToCurrentContext();
}

MaybeLocal<Module> ScriptCompiler::CompileModule(
    Isolate* isolate, Source* source, CompileOptions options,
    NoCacheReason no_cache_reason)
{
    CHECK(options == kNoCompileOptions || options == kConsumeCodeCache);

    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);

    Utils::ApiCheck(source->GetResourceOptions().IsModule(),
        "v8::ScriptCompiler::CompileModule",
        "Invalid ScriptOrigin: is_module must be true");
    auto maybe = CompileUnboundInternal(isolate, source, options, no_cache_reason);
    Local<UnboundScript> unbound;
    if (!maybe.ToLocal(&unbound))
        return MaybeLocal<Module>();

    i::Handle<i::SharedFunctionInfo> shared = Utils::OpenHandle(*unbound);
    return ToApiHandle<Module>(i_isolate->factory()->NewModule(shared));
}

namespace {
    bool IsIdentifier(i::Isolate* isolate, i::Handle<i::String> string)
    {
        string = i::String::Flatten(isolate, string);
        const int length = string->length();
        if (length == 0)
            return false;
        if (!i::IsIdentifierStart(string->Get(0)))
            return false;
        i::DisallowHeapAllocation no_gc;
        i::String::FlatContent flat = string->GetFlatContent(no_gc);
        if (flat.IsOneByte()) {
            auto vector = flat.ToOneByteVector();
            for (int i = 1; i < length; i++) {
                if (!i::IsIdentifierPart(vector[i]))
                    return false;
            }
        } else {
            auto vector = flat.ToUC16Vector();
            for (int i = 1; i < length; i++) {
                if (!i::IsIdentifierPart(vector[i]))
                    return false;
            }
        }
        return true;
    }
} // anonymous namespace

MaybeLocal<Function> ScriptCompiler::CompileFunctionInContext(
    Local<Context> v8_context, Source* source, size_t arguments_count,
    Local<String> arguments[], size_t context_extension_count,
    Local<Object> context_extensions[], CompileOptions options,
    NoCacheReason no_cache_reason)
{
    PREPARE_FOR_EXECUTION(v8_context, ScriptCompiler, CompileFunctionInContext,
        Function);
    TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.ScriptCompiler");

    DCHECK(options == CompileOptions::kConsumeCodeCache || options == CompileOptions::kEagerCompile || options == CompileOptions::kNoCompileOptions);

    i::Handle<i::Context> context = Utils::OpenHandle(*v8_context);

    DCHECK(context->IsNativeContext());
    i::Handle<i::SharedFunctionInfo> outer_info(
        context->empty_function()->shared(), isolate);

    i::Handle<i::JSFunction> fun;
    i::Handle<i::FixedArray> arguments_list = isolate->factory()->NewFixedArray(static_cast<int>(arguments_count));
    for (int i = 0; i < static_cast<int>(arguments_count); i++) {
        i::Handle<i::String> argument = Utils::OpenHandle(*arguments[i]);
        if (!IsIdentifier(isolate, argument))
            return Local<Function>();
        arguments_list->set(i, *argument);
    }

    for (size_t i = 0; i < context_extension_count; ++i) {
        i::Handle<i::JSReceiver> extension = Utils::OpenHandle(*context_extensions[i]);
        if (!extension->IsJSObject())
            return Local<Function>();
        context = isolate->factory()->NewWithContext(
            context,
            i::ScopeInfo::CreateForWithScope(
                isolate,
                context->IsNativeContext()
                    ? i::Handle<i::ScopeInfo>::null()
                    : i::Handle<i::ScopeInfo>(context->scope_info(), isolate)),
            extension);
    }

    i::Compiler::ScriptDetails script_details = GetScriptDetails(
        isolate, source->resource_name, source->resource_line_offset,
        source->resource_column_offset, source->source_map_url,
        source->host_defined_options);

    i::ScriptData* script_data = nullptr;
    if (options == kConsumeCodeCache) {
        DCHECK(source->cached_data);
        // ScriptData takes care of pointer-aligning the data.
        script_data = new i::ScriptData(source->cached_data->data,
            source->cached_data->length);
    }

    i::Handle<i::JSFunction> result;
    has_pending_exception = !i::Compiler::GetWrappedFunction(
        Utils::OpenHandle(*source->source_string), arguments_list, context,
        script_details, source->resource_options, script_data, options,
        no_cache_reason)
                                 .ToHandle(&result);
    if (options == kConsumeCodeCache) {
        source->cached_data->rejected = script_data->rejected();
    }
    delete script_data;
    RETURN_ON_FAILED_EXECUTION(Function);
    RETURN_ESCAPED(Utils::CallableToLocal(result));
}

void ScriptCompiler::ScriptStreamingTask::Run() { data_->task->Run(); }

ScriptCompiler::ScriptStreamingTask* ScriptCompiler::StartStreamingScript(
    Isolate* v8_isolate, StreamedSource* source, CompileOptions options)
{
    if (!i::FLAG_script_streaming) {
        return nullptr;
    }
    // We don't support other compile options on streaming background compiles.
    // TODO(rmcilroy): remove CompileOptions from the API.
    CHECK(options == ScriptCompiler::kNoCompileOptions);
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    i::ScriptStreamingData* data = source->impl();
    std::unique_ptr<i::BackgroundCompileTask> task = base::make_unique<i::BackgroundCompileTask>(data, isolate);
    data->task = std::move(task);
    return new ScriptCompiler::ScriptStreamingTask(data);
}

MaybeLocal<Script> ScriptCompiler::Compile(Local<Context> context,
    StreamedSource* v8_source,
    Local<String> full_source_string,
    const ScriptOrigin& origin)
{
    PREPARE_FOR_EXECUTION(context, ScriptCompiler, Compile, Script);
    TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.ScriptCompiler");
    TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"),
        "V8.CompileStreamedScript");

    i::Handle<i::String> str = Utils::OpenHandle(*(full_source_string));
    i::Compiler::ScriptDetails script_details = GetScriptDetails(
        isolate, origin.ResourceName(), origin.ResourceLineOffset(),
        origin.ResourceColumnOffset(), origin.SourceMapUrl(),
        origin.HostDefinedOptions());
    i::ScriptStreamingData* data = v8_source->impl();

    i::MaybeHandle<i::SharedFunctionInfo> maybe_function_info = i::Compiler::GetSharedFunctionInfoForStreamedScript(
        isolate, str, script_details, origin.Options(), data);

    i::Handle<i::SharedFunctionInfo> result;
    has_pending_exception = !maybe_function_info.ToHandle(&result);
    if (has_pending_exception)
        isolate->ReportPendingMessages();

    RETURN_ON_FAILED_EXECUTION(Script);

    Local<UnboundScript> generic = ToApiHandle<UnboundScript>(result);
    if (generic.IsEmpty())
        return Local<Script>();
    Local<Script> bound = generic->BindToCurrentContext();
    if (bound.IsEmpty())
        return Local<Script>();
    RETURN_ESCAPED(bound);
}

uint32_t ScriptCompiler::CachedDataVersionTag()
{
    return static_cast<uint32_t>(base::hash_combine(
        internal::Version::Hash(), internal::FlagList::Hash(),
        static_cast<uint32_t>(internal::CpuFeatures::SupportedFeatures())));
}

ScriptCompiler::CachedData* ScriptCompiler::CreateCodeCache(
    Local<UnboundScript> unbound_script)
{
    i::Handle<i::SharedFunctionInfo> shared = i::Handle<i::SharedFunctionInfo>::cast(
        Utils::OpenHandle(*unbound_script));
    DCHECK(shared->is_toplevel());
    return i::CodeSerializer::Serialize(shared);
}

// static
ScriptCompiler::CachedData* ScriptCompiler::CreateCodeCache(
    Local<UnboundModuleScript> unbound_module_script)
{
    i::Handle<i::SharedFunctionInfo> shared = i::Handle<i::SharedFunctionInfo>::cast(
        Utils::OpenHandle(*unbound_module_script));
    DCHECK(shared->is_toplevel());
    return i::CodeSerializer::Serialize(shared);
}

ScriptCompiler::CachedData* ScriptCompiler::CreateCodeCacheForFunction(
    Local<Function> function)
{
    auto js_function = i::Handle<i::JSFunction>::cast(Utils::OpenHandle(*function));
    i::Handle<i::SharedFunctionInfo> shared(js_function->shared(),
        js_function->GetIsolate());
    CHECK(shared->is_wrapped());
    return i::CodeSerializer::Serialize(shared);
}

MaybeLocal<Script> Script::Compile(Local<Context> context, Local<String> source,
    ScriptOrigin* origin)
{
    if (origin) {
        ScriptCompiler::Source script_source(source, *origin);
        return ScriptCompiler::Compile(context, &script_source);
    }
    ScriptCompiler::Source script_source(source);
    return ScriptCompiler::Compile(context, &script_source);
}

// --- E x c e p t i o n s ---

v8::TryCatch::TryCatch(v8::Isolate* isolate)
    : isolate_(reinterpret_cast<i::Isolate*>(isolate))
    , next_(isolate_->try_catch_handler())
    , is_verbose_(false)
    , can_continue_(true)
    , capture_message_(true)
    , rethrow_(false)
    , has_terminated_(false)
{
    ResetInternal();
    // Special handling for simulators which have a separate JS stack.
    js_stack_comparable_address_ = reinterpret_cast<void*>(
        i::SimulatorStack::RegisterJSStackComparableAddress(isolate_));
    isolate_->RegisterTryCatchHandler(this);
}

v8::TryCatch::~TryCatch()
{
    if (rethrow_) {
        v8::Isolate* isolate = reinterpret_cast<Isolate*>(isolate_);
        v8::HandleScope scope(isolate);
        v8::Local<v8::Value> exc = v8::Local<v8::Value>::New(isolate, Exception());
        if (HasCaught() && capture_message_) {
            // If an exception was caught and rethrow_ is indicated, the saved
            // message, script, and location need to be restored to Isolate TLS
            // for reuse.  capture_message_ needs to be disabled so that Throw()
            // does not create a new message.
            isolate_->thread_local_top()->rethrowing_message_ = true;
            isolate_->RestorePendingMessageFromTryCatch(this);
        }
        isolate_->UnregisterTryCatchHandler(this);
        i::SimulatorStack::UnregisterJSStackComparableAddress(isolate_);
        reinterpret_cast<Isolate*>(isolate_)->ThrowException(exc);
        DCHECK(!isolate_->thread_local_top()->rethrowing_message_);
    } else {
        if (HasCaught() && isolate_->has_scheduled_exception()) {
            // If an exception was caught but is still scheduled because no API call
            // promoted it, then it is canceled to prevent it from being propagated.
            // Note that this will not cancel termination exceptions.
            isolate_->CancelScheduledExceptionFromTryCatch(this);
        }
        isolate_->UnregisterTryCatchHandler(this);
        i::SimulatorStack::UnregisterJSStackComparableAddress(isolate_);
    }
}

void* v8::TryCatch::operator new(size_t) { base::OS::Abort(); }
void* v8::TryCatch::operator new[](size_t) { base::OS::Abort(); }
void v8::TryCatch::operator delete(void*, size_t) { base::OS::Abort(); }
void v8::TryCatch::operator delete[](void*, size_t) { base::OS::Abort(); }

bool v8::TryCatch::HasCaught() const
{
    return !i::Object(reinterpret_cast<i::Address>(exception_))
                ->IsTheHole(isolate_);
}

bool v8::TryCatch::CanContinue() const
{
    return can_continue_;
}

bool v8::TryCatch::HasTerminated() const
{
    return has_terminated_;
}

v8::Local<v8::Value> v8::TryCatch::ReThrow()
{
    if (!HasCaught())
        return v8::Local<v8::Value>();
    rethrow_ = true;
    return v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate_));
}

v8::Local<Value> v8::TryCatch::Exception() const
{
    if (HasCaught()) {
        // Check for out of memory exception.
        i::Object exception(reinterpret_cast<i::Address>(exception_));
        return v8::Utils::ToLocal(i::Handle<i::Object>(exception, isolate_));
    } else {
        return v8::Local<Value>();
    }
}

MaybeLocal<Value> v8::TryCatch::StackTrace(Local<Context> context) const
{
    if (!HasCaught())
        return v8::Local<Value>();
    i::Object raw_obj(reinterpret_cast<i::Address>(exception_));
    if (!raw_obj->IsJSObject())
        return v8::Local<Value>();
    PREPARE_FOR_EXECUTION(context, TryCatch, StackTrace, Value);
    i::Handle<i::JSObject> obj(i::JSObject::cast(raw_obj), isolate_);
    i::Handle<i::String> name = isolate->factory()->stack_string();
    Maybe<bool> maybe = i::JSReceiver::HasProperty(obj, name);
    has_pending_exception = maybe.IsNothing();
    RETURN_ON_FAILED_EXECUTION(Value);
    if (!maybe.FromJust())
        return v8::Local<Value>();
    Local<Value> result;
    has_pending_exception = !ToLocal<Value>(i::JSReceiver::GetProperty(isolate, obj, name), &result);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(result);
}

v8::Local<v8::Message> v8::TryCatch::Message() const
{
    i::Object message(reinterpret_cast<i::Address>(message_obj_));
    DCHECK(message->IsJSMessageObject() || message->IsTheHole(isolate_));
    if (HasCaught() && !message->IsTheHole(isolate_)) {
        return v8::Utils::MessageToLocal(i::Handle<i::Object>(message, isolate_));
    } else {
        return v8::Local<v8::Message>();
    }
}

void v8::TryCatch::Reset()
{
    if (!rethrow_ && HasCaught() && isolate_->has_scheduled_exception()) {
        // If an exception was caught but is still scheduled because no API call
        // promoted it, then it is canceled to prevent it from being propagated.
        // Note that this will not cancel termination exceptions.
        isolate_->CancelScheduledExceptionFromTryCatch(this);
    }
    ResetInternal();
}

void v8::TryCatch::ResetInternal()
{
    i::Object the_hole = i::ReadOnlyRoots(isolate_).the_hole_value();
    exception_ = reinterpret_cast<void*>(the_hole->ptr());
    message_obj_ = reinterpret_cast<void*>(the_hole->ptr());
}

void v8::TryCatch::SetVerbose(bool value)
{
    is_verbose_ = value;
}

bool v8::TryCatch::IsVerbose() const { return is_verbose_; }

void v8::TryCatch::SetCaptureMessage(bool value)
{
    capture_message_ = value;
}

// --- M e s s a g e ---

Local<String> Message::Get() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::String> raw_result = i::MessageHandler::GetMessage(isolate, obj);
    Local<String> result = Utils::ToLocal(raw_result);
    return scope.Escape(result);
}

v8::Isolate* Message::GetIsolate() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    return reinterpret_cast<Isolate*>(isolate);
}

ScriptOrigin Message::GetScriptOrigin() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    auto message = i::Handle<i::JSMessageObject>::cast(Utils::OpenHandle(this));
    i::Handle<i::Script> script(message->script(), isolate);
    return GetScriptOriginForScript(isolate, script);
}

v8::Local<Value> Message::GetScriptResourceName() const
{
    return GetScriptOrigin().ResourceName();
}

v8::Local<v8::StackTrace> Message::GetStackTrace() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
    auto message = i::Handle<i::JSMessageObject>::cast(Utils::OpenHandle(this));
    i::Handle<i::Object> stackFramesObj(message->stack_frames(), isolate);
    if (!stackFramesObj->IsFixedArray())
        return v8::Local<v8::StackTrace>();
    auto stackTrace = i::Handle<i::FixedArray>::cast(stackFramesObj);
    return scope.Escape(Utils::StackTraceToLocal(stackTrace));
}

Maybe<int> Message::GetLineNumber(Local<Context> context) const
{
    auto self = Utils::OpenHandle(this);
    i::Isolate* isolate = self->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    EscapableHandleScope handle_scope(reinterpret_cast<Isolate*>(isolate));
    auto msg = i::Handle<i::JSMessageObject>::cast(self);
    return Just(msg->GetLineNumber());
}

int Message::GetStartPosition() const
{
    auto self = Utils::OpenHandle(this);
    return self->start_position();
}

int Message::GetEndPosition() const
{
    auto self = Utils::OpenHandle(this);
    return self->end_position();
}

int Message::ErrorLevel() const
{
    auto self = Utils::OpenHandle(this);
    return self->error_level();
}

int Message::GetStartColumn() const
{
    auto self = Utils::OpenHandle(this);
    i::Isolate* isolate = self->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    EscapableHandleScope handle_scope(reinterpret_cast<Isolate*>(isolate));
    auto msg = i::Handle<i::JSMessageObject>::cast(self);
    return msg->GetColumnNumber();
}

Maybe<int> Message::GetStartColumn(Local<Context> context) const
{
    return Just(GetStartColumn());
}

int Message::GetEndColumn() const
{
    auto self = Utils::OpenHandle(this);
    i::Isolate* isolate = self->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    EscapableHandleScope handle_scope(reinterpret_cast<Isolate*>(isolate));
    auto msg = i::Handle<i::JSMessageObject>::cast(self);
    const int column_number = msg->GetColumnNumber();
    if (column_number == -1)
        return -1;
    const int start = self->start_position();
    const int end = self->end_position();
    return column_number + (end - start);
}

Maybe<int> Message::GetEndColumn(Local<Context> context) const
{
    return Just(GetEndColumn());
}

bool Message::IsSharedCrossOrigin() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    return Utils::OpenHandle(this)
        ->script()
        ->origin_options()
        .IsSharedCrossOrigin();
}

bool Message::IsOpaque() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    return Utils::OpenHandle(this)->script()->origin_options().IsOpaque();
}

MaybeLocal<String> Message::GetSourceLine(Local<Context> context) const
{
    auto self = Utils::OpenHandle(this);
    i::Isolate* isolate = self->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    EscapableHandleScope handle_scope(reinterpret_cast<Isolate*>(isolate));
    auto msg = i::Handle<i::JSMessageObject>::cast(self);
    RETURN_ESCAPED(Utils::ToLocal(msg->GetSourceLine()));
}

void Message::PrintCurrentStackTrace(Isolate* isolate, FILE* out)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i_isolate->PrintCurrentStackTrace(out);
}

// --- S t a c k T r a c e ---

Local<StackFrame> StackTrace::GetFrame(Isolate* v8_isolate,
    uint32_t index) const
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    EscapableHandleScope scope(v8_isolate);
    auto obj = handle(Utils::OpenHandle(this)->get(index), isolate);
    auto frame = i::Handle<i::StackTraceFrame>::cast(obj);
    return scope.Escape(Utils::StackFrameToLocal(frame));
}

int StackTrace::GetFrameCount() const
{
    return Utils::OpenHandle(this)->length();
}

Local<StackTrace> StackTrace::CurrentStackTrace(
    Isolate* isolate,
    int frame_limit,
    StackTraceOptions options)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::FixedArray> stackTrace = i_isolate->CaptureCurrentStackTrace(frame_limit, options);
    return Utils::StackTraceToLocal(stackTrace);
}

// --- S t a c k F r a m e ---

int StackFrame::GetLineNumber() const
{
    return i::StackTraceFrame::GetLineNumber(Utils::OpenHandle(this));
}

int StackFrame::GetColumn() const
{
    return i::StackTraceFrame::GetColumnNumber(Utils::OpenHandle(this));
}

int StackFrame::GetScriptId() const
{
    return i::StackTraceFrame::GetScriptId(Utils::OpenHandle(this));
}

Local<String> StackFrame::GetScriptName() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
    i::Handle<i::Object> name = i::StackTraceFrame::GetFileName(Utils::OpenHandle(this));
    return name->IsString()
        ? scope.Escape(Local<String>::Cast(Utils::ToLocal(name)))
        : Local<String>();
}

Local<String> StackFrame::GetScriptNameOrSourceURL() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
    i::Handle<i::Object> name = i::StackTraceFrame::GetScriptNameOrSourceUrl(Utils::OpenHandle(this));
    return name->IsString()
        ? scope.Escape(Local<String>::Cast(Utils::ToLocal(name)))
        : Local<String>();
}

Local<String> StackFrame::GetFunctionName() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
    i::Handle<i::Object> name = i::StackTraceFrame::GetFunctionName(Utils::OpenHandle(this));
    return name->IsString()
        ? scope.Escape(Local<String>::Cast(Utils::ToLocal(name)))
        : Local<String>();
}

bool StackFrame::IsEval() const
{
    return i::StackTraceFrame::IsEval(Utils::OpenHandle(this));
}

bool StackFrame::IsConstructor() const
{
    return i::StackTraceFrame::IsConstructor(Utils::OpenHandle(this));
}

bool StackFrame::IsWasm() const
{
    return i::StackTraceFrame::IsWasm(Utils::OpenHandle(this));
}

// --- J S O N ---

MaybeLocal<Value> JSON::Parse(Local<Context> context,
    Local<String> json_string)
{
    PREPARE_FOR_EXECUTION(context, JSON, Parse, Value);
    i::Handle<i::String> string = Utils::OpenHandle(*json_string);
    i::Handle<i::String> source = i::String::Flatten(isolate, string);
    i::Handle<i::Object> undefined = isolate->factory()->undefined_value();
    auto maybe = source->IsSeqOneByteString()
        ? i::JsonParser<true>::Parse(isolate, source, undefined)
        : i::JsonParser<false>::Parse(isolate, source, undefined);
    Local<Value> result;
    has_pending_exception = !ToLocal<Value>(maybe, &result);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(result);
}

MaybeLocal<String> JSON::Stringify(Local<Context> context,
    Local<Value> json_object,
    Local<String> gap)
{
    PREPARE_FOR_EXECUTION(context, JSON, Stringify, String);
    i::Handle<i::Object> object = Utils::OpenHandle(*json_object);
    i::Handle<i::Object> replacer = isolate->factory()->undefined_value();
    i::Handle<i::String> gap_string = gap.IsEmpty()
        ? isolate->factory()->empty_string()
        : Utils::OpenHandle(*gap);
    i::Handle<i::Object> maybe;
    has_pending_exception = !i::JsonStringify(isolate, object, replacer, gap_string).ToHandle(&maybe);
    RETURN_ON_FAILED_EXECUTION(String);
    Local<String> result;
    has_pending_exception = !ToLocal<String>(i::Object::ToString(isolate, maybe), &result);
    RETURN_ON_FAILED_EXECUTION(String);
    RETURN_ESCAPED(result);
}

// --- V a l u e   S e r i a l i z a t i o n ---

Maybe<bool> ValueSerializer::Delegate::WriteHostObject(Isolate* v8_isolate,
    Local<Object> object)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    isolate->ScheduleThrow(*isolate->factory()->NewError(
        isolate->error_function(), i::MessageTemplate::kDataCloneError,
        Utils::OpenHandle(*object)));
    return Nothing<bool>();
}

Maybe<uint32_t> ValueSerializer::Delegate::GetSharedArrayBufferId(
    Isolate* v8_isolate, Local<SharedArrayBuffer> shared_array_buffer)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    isolate->ScheduleThrow(*isolate->factory()->NewError(
        isolate->error_function(), i::MessageTemplate::kDataCloneError,
        Utils::OpenHandle(*shared_array_buffer)));
    return Nothing<uint32_t>();
}

Maybe<uint32_t> ValueSerializer::Delegate::GetWasmModuleTransferId(
    Isolate* v8_isolate, Local<WasmModuleObject> module)
{
    return Nothing<uint32_t>();
}

void* ValueSerializer::Delegate::ReallocateBufferMemory(void* old_buffer,
    size_t size,
    size_t* actual_size)
{
    *actual_size = size;
    return realloc(old_buffer, size);
}

void ValueSerializer::Delegate::FreeBufferMemory(void* buffer)
{
    return free(buffer);
}

struct ValueSerializer::PrivateData {
    explicit PrivateData(i::Isolate* i, ValueSerializer::Delegate* delegate)
        : isolate(i)
        , serializer(i, delegate)
    {
    }
    i::Isolate* isolate;
    i::ValueSerializer serializer;
};

ValueSerializer::ValueSerializer(Isolate* isolate)
    : ValueSerializer(isolate, nullptr)
{
}

ValueSerializer::ValueSerializer(Isolate* isolate, Delegate* delegate)
    : private_(
        new PrivateData(reinterpret_cast<i::Isolate*>(isolate), delegate))
{
}

ValueSerializer::~ValueSerializer() { delete private_; }

void ValueSerializer::WriteHeader() { private_->serializer.WriteHeader(); }

void ValueSerializer::SetTreatArrayBufferViewsAsHostObjects(bool mode)
{
    private_->serializer.SetTreatArrayBufferViewsAsHostObjects(mode);
}

Maybe<bool> ValueSerializer::WriteValue(Local<Context> context,
    Local<Value> value)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, ValueSerializer, WriteValue, Nothing<bool>(),
        i::HandleScope);
    i::Handle<i::Object> object = Utils::OpenHandle(*value);
    Maybe<bool> result = private_->serializer.WriteObject(object);
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return result;
}

std::pair<uint8_t*, size_t> ValueSerializer::Release()
{
    return private_->serializer.Release();
}

void ValueSerializer::TransferArrayBuffer(uint32_t transfer_id,
    Local<ArrayBuffer> array_buffer)
{
    private_->serializer.TransferArrayBuffer(transfer_id,
        Utils::OpenHandle(*array_buffer));
}

void ValueSerializer::WriteUint32(uint32_t value)
{
    private_->serializer.WriteUint32(value);
}

void ValueSerializer::WriteUint64(uint64_t value)
{
    private_->serializer.WriteUint64(value);
}

void ValueSerializer::WriteDouble(double value)
{
    private_->serializer.WriteDouble(value);
}

void ValueSerializer::WriteRawBytes(const void* source, size_t length)
{
    private_->serializer.WriteRawBytes(source, length);
}

MaybeLocal<Object> ValueDeserializer::Delegate::ReadHostObject(
    Isolate* v8_isolate)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    isolate->ScheduleThrow(*isolate->factory()->NewError(
        isolate->error_function(),
        i::MessageTemplate::kDataCloneDeserializationError));
    return MaybeLocal<Object>();
}

MaybeLocal<WasmModuleObject> ValueDeserializer::Delegate::GetWasmModuleFromId(
    Isolate* v8_isolate, uint32_t id)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    isolate->ScheduleThrow(*isolate->factory()->NewError(
        isolate->error_function(),
        i::MessageTemplate::kDataCloneDeserializationError));
    return MaybeLocal<WasmModuleObject>();
}

MaybeLocal<SharedArrayBuffer>
ValueDeserializer::Delegate::GetSharedArrayBufferFromId(Isolate* v8_isolate,
    uint32_t id)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    isolate->ScheduleThrow(*isolate->factory()->NewError(
        isolate->error_function(),
        i::MessageTemplate::kDataCloneDeserializationError));
    return MaybeLocal<SharedArrayBuffer>();
}

struct ValueDeserializer::PrivateData {
    PrivateData(i::Isolate* i, i::Vector<const uint8_t> data, Delegate* delegate)
        : isolate(i)
        , deserializer(i, data, delegate)
    {
    }
    i::Isolate* isolate;
    i::ValueDeserializer deserializer;
    bool has_aborted = false;
    bool supports_legacy_wire_format = false;
};

ValueDeserializer::ValueDeserializer(Isolate* isolate, const uint8_t* data,
    size_t size)
    : ValueDeserializer(isolate, data, size, nullptr)
{
}

ValueDeserializer::ValueDeserializer(Isolate* isolate, const uint8_t* data,
    size_t size, Delegate* delegate)
{
    if (base::IsValueInRangeForNumericType<int>(size)) {
        private_ = new PrivateData(
            reinterpret_cast<i::Isolate*>(isolate),
            i::Vector<const uint8_t>(data, static_cast<int>(size)), delegate);
    } else {
        private_ = new PrivateData(reinterpret_cast<i::Isolate*>(isolate),
            i::Vector<const uint8_t>(nullptr, 0), nullptr);
        private_->has_aborted = true;
    }
}

ValueDeserializer::~ValueDeserializer() { delete private_; }

Maybe<bool> ValueDeserializer::ReadHeader(Local<Context> context)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8_NO_SCRIPT(isolate, context, ValueDeserializer, ReadHeader,
        Nothing<bool>(), i::HandleScope);

    // We could have aborted during the constructor.
    // If so, ReadHeader is where we report it.
    if (private_->has_aborted) {
        isolate->Throw(*isolate->factory()->NewError(
            i::MessageTemplate::kDataCloneDeserializationError));
        has_pending_exception = true;
        RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    }

    bool read_header = false;
    has_pending_exception = !private_->deserializer.ReadHeader().To(&read_header);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    DCHECK(read_header);

    static const uint32_t kMinimumNonLegacyVersion = 13;
    if (GetWireFormatVersion() < kMinimumNonLegacyVersion && !private_->supports_legacy_wire_format) {
        isolate->Throw(*isolate->factory()->NewError(
            i::MessageTemplate::kDataCloneDeserializationVersionError));
        has_pending_exception = true;
        RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    }

    return Just(true);
}

void ValueDeserializer::SetSupportsLegacyWireFormat(
    bool supports_legacy_wire_format)
{
    private_->supports_legacy_wire_format = supports_legacy_wire_format;
}

void ValueDeserializer::SetExpectInlineWasm(bool expect_inline_wasm)
{
    private_->deserializer.set_expect_inline_wasm(expect_inline_wasm);
}

uint32_t ValueDeserializer::GetWireFormatVersion() const
{
    CHECK(!private_->has_aborted);
    return private_->deserializer.GetWireFormatVersion();
}

MaybeLocal<Value> ValueDeserializer::ReadValue(Local<Context> context)
{
    CHECK(!private_->has_aborted);
    PREPARE_FOR_EXECUTION(context, ValueDeserializer, ReadValue, Value);
    i::MaybeHandle<i::Object> result;
    if (GetWireFormatVersion() > 0) {
        result = private_->deserializer.ReadObject();
    } else {
        result = private_->deserializer.ReadObjectUsingEntireBufferForLegacyFormat();
    }
    Local<Value> value;
    has_pending_exception = !ToLocal(result, &value);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(value);
}

void ValueDeserializer::TransferArrayBuffer(uint32_t transfer_id,
    Local<ArrayBuffer> array_buffer)
{
    CHECK(!private_->has_aborted);
    private_->deserializer.TransferArrayBuffer(transfer_id,
        Utils::OpenHandle(*array_buffer));
}

void ValueDeserializer::TransferSharedArrayBuffer(
    uint32_t transfer_id, Local<SharedArrayBuffer> shared_array_buffer)
{
    CHECK(!private_->has_aborted);
    private_->deserializer.TransferArrayBuffer(
        transfer_id, Utils::OpenHandle(*shared_array_buffer));
}

bool ValueDeserializer::ReadUint32(uint32_t* value)
{
    return private_->deserializer.ReadUint32(value);
}

bool ValueDeserializer::ReadUint64(uint64_t* value)
{
    return private_->deserializer.ReadUint64(value);
}

bool ValueDeserializer::ReadDouble(double* value)
{
    return private_->deserializer.ReadDouble(value);
}

bool ValueDeserializer::ReadRawBytes(size_t length, const void** data)
{
    return private_->deserializer.ReadRawBytes(length, data);
}

// --- D a t a ---

bool Value::FullIsUndefined() const
{
    i::Handle<i::Object> object = Utils::OpenHandle(this);
    bool result = object->IsUndefined();
    DCHECK_EQ(result, QuickIsUndefined());
    return result;
}

bool Value::FullIsNull() const
{
    i::Handle<i::Object> object = Utils::OpenHandle(this);
    bool result = object->IsNull();
    DCHECK_EQ(result, QuickIsNull());
    return result;
}

bool Value::IsTrue() const
{
    i::Handle<i::Object> object = Utils::OpenHandle(this);
    if (object->IsSmi())
        return false;
    return object->IsTrue();
}

bool Value::IsFalse() const
{
    i::Handle<i::Object> object = Utils::OpenHandle(this);
    if (object->IsSmi())
        return false;
    return object->IsFalse();
}

bool Value::IsFunction() const { return Utils::OpenHandle(this)->IsCallable(); }

bool Value::IsName() const
{
    return Utils::OpenHandle(this)->IsName();
}

bool Value::FullIsString() const
{
    bool result = Utils::OpenHandle(this)->IsString();
    DCHECK_EQ(result, QuickIsString());
    return result;
}

bool Value::IsSymbol() const
{
    return Utils::OpenHandle(this)->IsSymbol();
}

bool Value::IsArray() const
{
    return Utils::OpenHandle(this)->IsJSArray();
}

bool Value::IsArrayBuffer() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    return obj->IsJSArrayBuffer() && !i::JSArrayBuffer::cast(*obj)->is_shared();
}

bool Value::IsArrayBufferView() const
{
    return Utils::OpenHandle(this)->IsJSArrayBufferView();
}

bool Value::IsTypedArray() const
{
    return Utils::OpenHandle(this)->IsJSTypedArray();
}

#define VALUE_IS_TYPED_ARRAY(Type, typeName, TYPE, ctype)                                                 \
    bool Value::Is##Type##Array() const                                                                   \
    {                                                                                                     \
        i::Handle<i::Object> obj = Utils::OpenHandle(this);                                               \
        return obj->IsJSTypedArray() && i::JSTypedArray::cast(*obj)->type() == i::kExternal##Type##Array; \
    }

TYPED_ARRAYS(VALUE_IS_TYPED_ARRAY)

#undef VALUE_IS_TYPED_ARRAY

bool Value::IsDataView() const
{
    return Utils::OpenHandle(this)->IsJSDataView();
}

bool Value::IsSharedArrayBuffer() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    return obj->IsJSArrayBuffer() && i::JSArrayBuffer::cast(*obj)->is_shared();
}

bool Value::IsObject() const { return Utils::OpenHandle(this)->IsJSReceiver(); }

bool Value::IsNumber() const
{
    return Utils::OpenHandle(this)->IsNumber();
}

bool Value::IsBigInt() const { return Utils::OpenHandle(this)->IsBigInt(); }

bool Value::IsProxy() const { return Utils::OpenHandle(this)->IsJSProxy(); }

#define VALUE_IS_SPECIFIC_TYPE(Type, Check)                 \
    bool Value::Is##Type() const                            \
    {                                                       \
        i::Handle<i::Object> obj = Utils::OpenHandle(this); \
        return obj->Is##Check();                            \
    }

VALUE_IS_SPECIFIC_TYPE(ArgumentsObject, JSArgumentsObject)
VALUE_IS_SPECIFIC_TYPE(BigIntObject, BigIntWrapper)
VALUE_IS_SPECIFIC_TYPE(BooleanObject, BooleanWrapper)
VALUE_IS_SPECIFIC_TYPE(NumberObject, NumberWrapper)
VALUE_IS_SPECIFIC_TYPE(StringObject, StringWrapper)
VALUE_IS_SPECIFIC_TYPE(SymbolObject, SymbolWrapper)
VALUE_IS_SPECIFIC_TYPE(Date, JSDate)
VALUE_IS_SPECIFIC_TYPE(Map, JSMap)
VALUE_IS_SPECIFIC_TYPE(Set, JSSet)
VALUE_IS_SPECIFIC_TYPE(WeakMap, JSWeakMap)
VALUE_IS_SPECIFIC_TYPE(WeakSet, JSWeakSet)
VALUE_IS_SPECIFIC_TYPE(WebAssemblyCompiledModule, WasmModuleObject)

#undef VALUE_IS_SPECIFIC_TYPE

bool Value::IsBoolean() const
{
    return Utils::OpenHandle(this)->IsBoolean();
}

bool Value::IsExternal() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (!obj->IsHeapObject())
        return false;
    i::Handle<i::HeapObject> heap_obj = i::Handle<i::HeapObject>::cast(obj);
    // Check the instance type is JS_OBJECT (instance type of Externals) before
    // attempting to get the Isolate since that guarantees the object is writable
    // and GetIsolate will work.
    if (heap_obj->map()->instance_type() != i::JS_OBJECT_TYPE)
        return false;
    i::Isolate* isolate = i::JSObject::cast(*heap_obj)->GetIsolate();
    return heap_obj->IsExternal(isolate);
}

bool Value::IsInt32() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsSmi())
        return true;
    if (obj->IsNumber()) {
        return i::IsInt32Double(obj->Number());
    }
    return false;
}

bool Value::IsUint32() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsSmi())
        return i::Smi::ToInt(*obj) >= 0;
    if (obj->IsNumber()) {
        double value = obj->Number();
        return !i::IsMinusZero(value) && value >= 0 && value <= i::kMaxUInt32 && value == i::FastUI2D(i::FastD2UI(value));
    }
    return false;
}

bool Value::IsNativeError() const
{
    return Utils::OpenHandle(this)->IsJSError();
}

bool Value::IsRegExp() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    return obj->IsJSRegExp();
}

bool Value::IsAsyncFunction() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (!obj->IsJSFunction())
        return false;
    i::Handle<i::JSFunction> func = i::Handle<i::JSFunction>::cast(obj);
    return i::IsAsyncFunction(func->shared()->kind());
}

bool Value::IsGeneratorFunction() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (!obj->IsJSFunction())
        return false;
    i::Handle<i::JSFunction> func = i::Handle<i::JSFunction>::cast(obj);
    return i::IsGeneratorFunction(func->shared()->kind());
}

bool Value::IsGeneratorObject() const
{
    return Utils::OpenHandle(this)->IsJSGeneratorObject();
}

bool Value::IsMapIterator() const
{
    return Utils::OpenHandle(this)->IsJSMapIterator();
}

bool Value::IsSetIterator() const
{
    return Utils::OpenHandle(this)->IsJSSetIterator();
}

bool Value::IsPromise() const { return Utils::OpenHandle(this)->IsJSPromise(); }

bool Value::IsModuleNamespaceObject() const
{
    return Utils::OpenHandle(this)->IsJSModuleNamespace();
}

MaybeLocal<String> Value::ToString(Local<Context> context) const
{
    auto obj = Utils::OpenHandle(this);
    if (obj->IsString())
        return ToApiHandle<String>(obj);
    PREPARE_FOR_EXECUTION(context, Object, ToString, String);
    Local<String> result;
    has_pending_exception = !ToLocal<String>(i::Object::ToString(isolate, obj), &result);
    RETURN_ON_FAILED_EXECUTION(String);
    RETURN_ESCAPED(result);
}

Local<String> Value::ToString(Isolate* isolate) const
{
    RETURN_TO_LOCAL_UNCHECKED(ToString(isolate->GetCurrentContext()), String);
}

MaybeLocal<String> Value::ToDetailString(Local<Context> context) const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsString())
        return ToApiHandle<String>(obj);
    PREPARE_FOR_EXECUTION(context, Object, ToDetailString, String);
    Local<String> result = Utils::ToLocal(i::Object::NoSideEffectsToString(isolate, obj));
    RETURN_ON_FAILED_EXECUTION(String);
    RETURN_ESCAPED(result);
}

MaybeLocal<Object> Value::ToObject(Local<Context> context) const
{
    auto obj = Utils::OpenHandle(this);
    if (obj->IsJSReceiver())
        return ToApiHandle<Object>(obj);
    PREPARE_FOR_EXECUTION(context, Object, ToObject, Object);
    Local<Object> result;
    has_pending_exception = !ToLocal<Object>(i::Object::ToObject(isolate, obj), &result);
    RETURN_ON_FAILED_EXECUTION(Object);
    RETURN_ESCAPED(result);
}

Local<v8::Object> Value::ToObject(Isolate* isolate) const
{
    RETURN_TO_LOCAL_UNCHECKED(ToObject(isolate->GetCurrentContext()), Object);
}

MaybeLocal<BigInt> Value::ToBigInt(Local<Context> context) const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsBigInt())
        return ToApiHandle<BigInt>(obj);
    PREPARE_FOR_EXECUTION(context, Object, ToBigInt, BigInt);
    Local<BigInt> result;
    has_pending_exception = !ToLocal<BigInt>(i::BigInt::FromObject(isolate, obj), &result);
    RETURN_ON_FAILED_EXECUTION(BigInt);
    RETURN_ESCAPED(result);
}

bool Value::BooleanValue(Isolate* v8_isolate) const
{
    return Utils::OpenHandle(this)->BooleanValue(reinterpret_cast<i::Isolate*>(v8_isolate));
}

bool Value::BooleanValue() const
{
    return BooleanValue(Isolate::GetCurrent());
}

Maybe<bool> Value::BooleanValue(Local<Context> context) const
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    return Just(Utils::OpenHandle(this)->BooleanValue(isolate));
}

MaybeLocal<Boolean> Value::ToBoolean(Local<Context> context) const
{
    return ToBoolean(context->GetIsolate());
}

Local<Boolean> Value::ToBoolean(Isolate* v8_isolate) const
{
    auto isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    return ToApiHandle<Boolean>(isolate->factory()->ToBoolean(BooleanValue(v8_isolate)));
}

MaybeLocal<Number> Value::ToNumber(Local<Context> context) const
{
    auto obj = Utils::OpenHandle(this);
    if (obj->IsNumber())
        return ToApiHandle<Number>(obj);
    PREPARE_FOR_EXECUTION(context, Object, ToNumber, Number);
    Local<Number> result;
    has_pending_exception = !ToLocal<Number>(i::Object::ToNumber(isolate, obj), &result);
    RETURN_ON_FAILED_EXECUTION(Number);
    RETURN_ESCAPED(result);
}

Local<Number> Value::ToNumber(Isolate* isolate) const
{
    RETURN_TO_LOCAL_UNCHECKED(ToNumber(isolate->GetCurrentContext()), Number);
}

MaybeLocal<Integer> Value::ToInteger(Local<Context> context) const
{
    auto obj = Utils::OpenHandle(this);
    if (obj->IsSmi())
        return ToApiHandle<Integer>(obj);
    PREPARE_FOR_EXECUTION(context, Object, ToInteger, Integer);
    Local<Integer> result;
    has_pending_exception = !ToLocal<Integer>(i::Object::ToInteger(isolate, obj), &result);
    RETURN_ON_FAILED_EXECUTION(Integer);
    RETURN_ESCAPED(result);
}

Local<Integer> Value::ToInteger(Isolate* isolate) const
{
    RETURN_TO_LOCAL_UNCHECKED(ToInteger(isolate->GetCurrentContext()), Integer);
}

MaybeLocal<Int32> Value::ToInt32(Local<Context> context) const
{
    auto obj = Utils::OpenHandle(this);
    if (obj->IsSmi())
        return ToApiHandle<Int32>(obj);
    Local<Int32> result;
    PREPARE_FOR_EXECUTION(context, Object, ToInt32, Int32);
    has_pending_exception = !ToLocal<Int32>(i::Object::ToInt32(isolate, obj), &result);
    RETURN_ON_FAILED_EXECUTION(Int32);
    RETURN_ESCAPED(result);
}

Local<Int32> Value::ToInt32(Isolate* isolate) const
{
    RETURN_TO_LOCAL_UNCHECKED(ToInt32(isolate->GetCurrentContext()), Int32);
}

MaybeLocal<Uint32> Value::ToUint32(Local<Context> context) const
{
    auto obj = Utils::OpenHandle(this);
    if (obj->IsSmi())
        return ToApiHandle<Uint32>(obj);
    Local<Uint32> result;
    PREPARE_FOR_EXECUTION(context, Object, ToUint32, Uint32);
    has_pending_exception = !ToLocal<Uint32>(i::Object::ToUint32(isolate, obj), &result);
    RETURN_ON_FAILED_EXECUTION(Uint32);
    RETURN_ESCAPED(result);
}

i::Isolate* i::IsolateFromNeverReadOnlySpaceObject(i::Address obj)
{
    return i::NeverReadOnlySpaceObject::GetIsolate(
        i::HeapObject::cast(i::Object(obj)));
}

bool i::ShouldThrowOnError(i::Isolate* isolate)
{
    return i::GetShouldThrow(isolate, Nothing<i::ShouldThrow>()) == i::ShouldThrow::kThrowOnError;
}

void i::Internals::CheckInitializedImpl(v8::Isolate* external_isolate)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(external_isolate);
    Utils::ApiCheck(isolate != nullptr && !isolate->IsDead(),
        "v8::internal::Internals::CheckInitialized",
        "Isolate is not initialized or V8 has died");
}

void External::CheckCast(v8::Value* that)
{
    Utils::ApiCheck(that->IsExternal(), "v8::External::Cast",
        "Could not convert to external");
}

void v8::Object::CheckCast(Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsJSReceiver(), "v8::Object::Cast",
        "Could not convert to object");
}

void v8::Function::CheckCast(Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsCallable(), "v8::Function::Cast",
        "Could not convert to function");
}

void v8::Boolean::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsBoolean(), "v8::Boolean::Cast",
        "Could not convert to boolean");
}

void v8::Name::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsName(), "v8::Name::Cast", "Could not convert to name");
}

void v8::String::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsString(), "v8::String::Cast",
        "Could not convert to string");
}

void v8::Symbol::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsSymbol(), "v8::Symbol::Cast",
        "Could not convert to symbol");
}

void v8::Private::CheckCast(v8::Data* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsSymbol() && i::Handle<i::Symbol>::cast(obj)->is_private(),
        "v8::Private::Cast",
        "Could not convert to private");
}

void v8::Number::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsNumber(),
        "v8::Number::Cast()",
        "Could not convert to number");
}

void v8::Integer::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsNumber(), "v8::Integer::Cast",
        "Could not convert to number");
}

void v8::Int32::CheckCast(v8::Value* that)
{
    Utils::ApiCheck(that->IsInt32(), "v8::Int32::Cast",
        "Could not convert to 32-bit signed integer");
}

void v8::Uint32::CheckCast(v8::Value* that)
{
    Utils::ApiCheck(that->IsUint32(), "v8::Uint32::Cast",
        "Could not convert to 32-bit unsigned integer");
}

void v8::BigInt::CheckCast(v8::Value* that)
{
    Utils::ApiCheck(that->IsBigInt(), "v8::BigInt::Cast",
        "Could not convert to BigInt");
}

void v8::Array::CheckCast(Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsJSArray(), "v8::Array::Cast",
        "Could not convert to array");
}

void v8::Map::CheckCast(Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsJSMap(), "v8::Map::Cast", "Could not convert to Map");
}

void v8::Set::CheckCast(Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsJSSet(), "v8_Set_Cast", "Could not convert to Set");
}

void v8::Promise::CheckCast(Value* that)
{
    Utils::ApiCheck(that->IsPromise(), "v8::Promise::Cast",
        "Could not convert to promise");
}

void v8::Promise::Resolver::CheckCast(Value* that)
{
    Utils::ApiCheck(that->IsPromise(), "v8::Promise::Resolver::Cast",
        "Could not convert to promise resolver");
}

void v8::Proxy::CheckCast(Value* that)
{
    Utils::ApiCheck(that->IsProxy(), "v8::Proxy::Cast",
        "Could not convert to proxy");
}

void v8::WasmModuleObject::CheckCast(Value* that)
{
    Utils::ApiCheck(that->IsWebAssemblyCompiledModule(),
        "v8::WasmModuleObject::Cast",
        "Could not convert to wasm module object");
}

void v8::ArrayBuffer::CheckCast(Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(
        obj->IsJSArrayBuffer() && !i::JSArrayBuffer::cast(*obj)->is_shared(),
        "v8::ArrayBuffer::Cast()", "Could not convert to ArrayBuffer");
}

void v8::ArrayBufferView::CheckCast(Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsJSArrayBufferView(),
        "v8::ArrayBufferView::Cast()",
        "Could not convert to ArrayBufferView");
}

void v8::TypedArray::CheckCast(Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsJSTypedArray(),
        "v8::TypedArray::Cast()",
        "Could not convert to TypedArray");
}

#define CHECK_TYPED_ARRAY_CAST(Type, typeName, TYPE, ctype)                                            \
    void v8::Type##Array::CheckCast(Value* that)                                                       \
    {                                                                                                  \
        i::Handle<i::Object> obj = Utils::OpenHandle(that);                                            \
        Utils::ApiCheck(                                                                               \
            obj->IsJSTypedArray() && i::JSTypedArray::cast(*obj)->type() == i::kExternal##Type##Array, \
            "v8::" #Type "Array::Cast()", "Could not convert to " #Type "Array");                      \
    }

TYPED_ARRAYS(CHECK_TYPED_ARRAY_CAST)

#undef CHECK_TYPED_ARRAY_CAST

void v8::DataView::CheckCast(Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsJSDataView(),
        "v8::DataView::Cast()",
        "Could not convert to DataView");
}

void v8::SharedArrayBuffer::CheckCast(Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(
        obj->IsJSArrayBuffer() && i::JSArrayBuffer::cast(*obj)->is_shared(),
        "v8::SharedArrayBuffer::Cast()",
        "Could not convert to SharedArrayBuffer");
}

void v8::Date::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsJSDate(), "v8::Date::Cast()",
        "Could not convert to date");
}

void v8::StringObject::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsStringWrapper(), "v8::StringObject::Cast()",
        "Could not convert to StringObject");
}

void v8::SymbolObject::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsSymbolWrapper(), "v8::SymbolObject::Cast()",
        "Could not convert to SymbolObject");
}

void v8::NumberObject::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsNumberWrapper(), "v8::NumberObject::Cast()",
        "Could not convert to NumberObject");
}

void v8::BigIntObject::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsBigIntWrapper(), "v8::BigIntObject::Cast()",
        "Could not convert to BigIntObject");
}

void v8::BooleanObject::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsBooleanWrapper(), "v8::BooleanObject::Cast()",
        "Could not convert to BooleanObject");
}

void v8::RegExp::CheckCast(v8::Value* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsJSRegExp(),
        "v8::RegExp::Cast()",
        "Could not convert to regular expression");
}

Maybe<double> Value::NumberValue(Local<Context> context) const
{
    auto obj = Utils::OpenHandle(this);
    if (obj->IsNumber())
        return Just(obj->Number());
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Value, NumberValue, Nothing<double>(),
        i::HandleScope);
    i::Handle<i::Object> num;
    has_pending_exception = !i::Object::ToNumber(isolate, obj).ToHandle(&num);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(double);
    return Just(num->Number());
}

Maybe<int64_t> Value::IntegerValue(Local<Context> context) const
{
    auto obj = Utils::OpenHandle(this);
    if (obj->IsNumber()) {
        return Just(NumberToInt64(*obj));
    }
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Value, IntegerValue, Nothing<int64_t>(),
        i::HandleScope);
    i::Handle<i::Object> num;
    has_pending_exception = !i::Object::ToInteger(isolate, obj).ToHandle(&num);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(int64_t);
    return Just(NumberToInt64(*num));
}

Maybe<int32_t> Value::Int32Value(Local<Context> context) const
{
    auto obj = Utils::OpenHandle(this);
    if (obj->IsNumber())
        return Just(NumberToInt32(*obj));
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Value, Int32Value, Nothing<int32_t>(),
        i::HandleScope);
    i::Handle<i::Object> num;
    has_pending_exception = !i::Object::ToInt32(isolate, obj).ToHandle(&num);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(int32_t);
    return Just(num->IsSmi() ? i::Smi::ToInt(*num)
                             : static_cast<int32_t>(num->Number()));
}

Maybe<uint32_t> Value::Uint32Value(Local<Context> context) const
{
    auto obj = Utils::OpenHandle(this);
    if (obj->IsNumber())
        return Just(NumberToUint32(*obj));
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Value, Uint32Value, Nothing<uint32_t>(),
        i::HandleScope);
    i::Handle<i::Object> num;
    has_pending_exception = !i::Object::ToUint32(isolate, obj).ToHandle(&num);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(uint32_t);
    return Just(num->IsSmi() ? static_cast<uint32_t>(i::Smi::ToInt(*num))
                             : static_cast<uint32_t>(num->Number()));
}

MaybeLocal<Uint32> Value::ToArrayIndex(Local<Context> context) const
{
    auto self = Utils::OpenHandle(this);
    if (self->IsSmi()) {
        if (i::Smi::ToInt(*self) >= 0)
            return Utils::Uint32ToLocal(self);
        return Local<Uint32>();
    }
    PREPARE_FOR_EXECUTION(context, Object, ToArrayIndex, Uint32);
    i::Handle<i::Object> string_obj;
    has_pending_exception = !i::Object::ToString(isolate, self).ToHandle(&string_obj);
    RETURN_ON_FAILED_EXECUTION(Uint32);
    i::Handle<i::String> str = i::Handle<i::String>::cast(string_obj);
    uint32_t index;
    if (str->AsArrayIndex(&index)) {
        i::Handle<i::Object> value;
        if (index <= static_cast<uint32_t>(i::Smi::kMaxValue)) {
            value = i::Handle<i::Object>(i::Smi::FromInt(index), isolate);
        } else {
            value = isolate->factory()->NewNumber(index);
        }
        RETURN_ESCAPED(Utils::Uint32ToLocal(value));
    }
    return Local<Uint32>();
}

Maybe<bool> Value::Equals(Local<Context> context, Local<Value> that) const
{
    i::Isolate* isolate = Utils::OpenHandle(*context)->GetIsolate();
    auto self = Utils::OpenHandle(this);
    auto other = Utils::OpenHandle(*that);
    return i::Object::Equals(isolate, self, other);
}

bool Value::StrictEquals(Local<Value> that) const
{
    auto self = Utils::OpenHandle(this);
    auto other = Utils::OpenHandle(*that);
    return self->StrictEquals(*other);
}

bool Value::SameValue(Local<Value> that) const
{
    auto self = Utils::OpenHandle(this);
    auto other = Utils::OpenHandle(*that);
    return self->SameValue(*other);
}

Local<String> Value::TypeOf(v8::Isolate* external_isolate)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(external_isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    LOG_API(isolate, Value, TypeOf);
    return Utils::ToLocal(i::Object::TypeOf(isolate, Utils::OpenHandle(this)));
}

Maybe<bool> Value::InstanceOf(v8::Local<v8::Context> context,
    v8::Local<v8::Object> object)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Value, InstanceOf, Nothing<bool>(),
        i::HandleScope);
    auto left = Utils::OpenHandle(this);
    auto right = Utils::OpenHandle(*object);
    i::Handle<i::Object> result;
    has_pending_exception = !i::Object::InstanceOf(isolate, left, right).ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(result->IsTrue(isolate));
}

Maybe<bool> v8::Object::Set(v8::Local<v8::Context> context,
    v8::Local<Value> key, v8::Local<Value> value)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, Set, Nothing<bool>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    auto key_obj = Utils::OpenHandle(*key);
    auto value_obj = Utils::OpenHandle(*value);
    has_pending_exception = i::Runtime::SetObjectProperty(isolate, self, key_obj, value_obj,
        i::StoreOrigin::kMaybeKeyed,
        Just(i::ShouldThrow::kDontThrow))
                                .is_null();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(true);
}

bool v8::Object::Set(v8::Local<Value> key, v8::Local<Value> value)
{
    auto context = ContextFromNeverReadOnlySpaceObject(Utils::OpenHandle(this));
    return Set(context, key, value).FromMaybe(false);
}

Maybe<bool> v8::Object::Set(v8::Local<v8::Context> context, uint32_t index,
    v8::Local<Value> value)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, Set, Nothing<bool>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    auto value_obj = Utils::OpenHandle(*value);
    has_pending_exception = i::Object::SetElement(isolate, self, index, value_obj,
        i::ShouldThrow::kDontThrow)
                                .is_null();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(true);
}

bool v8::Object::Set(uint32_t index, v8::Local<Value> value)
{
    auto context = ContextFromNeverReadOnlySpaceObject(Utils::OpenHandle(this));
    return Set(context, index, value).FromMaybe(false);
}

Maybe<bool> v8::Object::CreateDataProperty(v8::Local<v8::Context> context,
    v8::Local<Name> key,
    v8::Local<Value> value)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, CreateDataProperty, Nothing<bool>(),
        i::HandleScope);
    i::Handle<i::JSReceiver> self = Utils::OpenHandle(this);
    i::Handle<i::Name> key_obj = Utils::OpenHandle(*key);
    i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);

    Maybe<bool> result = i::JSReceiver::CreateDataProperty(
        isolate, self, key_obj, value_obj, Just(i::kDontThrow));
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return result;
}

Maybe<bool> v8::Object::CreateDataProperty(v8::Local<v8::Context> context,
    uint32_t index,
    v8::Local<Value> value)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, CreateDataProperty, Nothing<bool>(),
        i::HandleScope);
    i::Handle<i::JSReceiver> self = Utils::OpenHandle(this);
    i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);

    i::LookupIterator it(isolate, self, index, self, i::LookupIterator::OWN);
    Maybe<bool> result = i::JSReceiver::CreateDataProperty(&it, value_obj, Just(i::kDontThrow));
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return result;
}

struct v8::PropertyDescriptor::PrivateData {
    PrivateData()
        : desc()
    {
    }
    i::PropertyDescriptor desc;
};

v8::PropertyDescriptor::PropertyDescriptor()
    : private_(new PrivateData())
{
}

// DataDescriptor
v8::PropertyDescriptor::PropertyDescriptor(v8::Local<v8::Value> value)
    : private_(new PrivateData())
{
    private_->desc.set_value(Utils::OpenHandle(*value, true));
}

// DataDescriptor with writable field
v8::PropertyDescriptor::PropertyDescriptor(v8::Local<v8::Value> value,
    bool writable)
    : private_(new PrivateData())
{
    private_->desc.set_value(Utils::OpenHandle(*value, true));
    private_->desc.set_writable(writable);
}

// AccessorDescriptor
v8::PropertyDescriptor::PropertyDescriptor(v8::Local<v8::Value> get,
    v8::Local<v8::Value> set)
    : private_(new PrivateData())
{
    DCHECK(get.IsEmpty() || get->IsUndefined() || get->IsFunction());
    DCHECK(set.IsEmpty() || set->IsUndefined() || set->IsFunction());
    private_->desc.set_get(Utils::OpenHandle(*get, true));
    private_->desc.set_set(Utils::OpenHandle(*set, true));
}

v8::PropertyDescriptor::~PropertyDescriptor() { delete private_; }

v8::Local<Value> v8::PropertyDescriptor::value() const
{
    DCHECK(private_->desc.has_value());
    return Utils::ToLocal(private_->desc.value());
}

v8::Local<Value> v8::PropertyDescriptor::get() const
{
    DCHECK(private_->desc.has_get());
    return Utils::ToLocal(private_->desc.get());
}

v8::Local<Value> v8::PropertyDescriptor::set() const
{
    DCHECK(private_->desc.has_set());
    return Utils::ToLocal(private_->desc.set());
}

bool v8::PropertyDescriptor::has_value() const
{
    return private_->desc.has_value();
}
bool v8::PropertyDescriptor::has_get() const
{
    return private_->desc.has_get();
}
bool v8::PropertyDescriptor::has_set() const
{
    return private_->desc.has_set();
}

bool v8::PropertyDescriptor::writable() const
{
    DCHECK(private_->desc.has_writable());
    return private_->desc.writable();
}

bool v8::PropertyDescriptor::has_writable() const
{
    return private_->desc.has_writable();
}

void v8::PropertyDescriptor::set_enumerable(bool enumerable)
{
    private_->desc.set_enumerable(enumerable);
}

bool v8::PropertyDescriptor::enumerable() const
{
    DCHECK(private_->desc.has_enumerable());
    return private_->desc.enumerable();
}

bool v8::PropertyDescriptor::has_enumerable() const
{
    return private_->desc.has_enumerable();
}

void v8::PropertyDescriptor::set_configurable(bool configurable)
{
    private_->desc.set_configurable(configurable);
}

bool v8::PropertyDescriptor::configurable() const
{
    DCHECK(private_->desc.has_configurable());
    return private_->desc.configurable();
}

bool v8::PropertyDescriptor::has_configurable() const
{
    return private_->desc.has_configurable();
}

Maybe<bool> v8::Object::DefineOwnProperty(v8::Local<v8::Context> context,
    v8::Local<Name> key,
    v8::Local<Value> value,
    v8::PropertyAttribute attributes)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    i::Handle<i::JSReceiver> self = Utils::OpenHandle(this);
    i::Handle<i::Name> key_obj = Utils::OpenHandle(*key);
    i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);

    i::PropertyDescriptor desc;
    desc.set_writable(!(attributes & v8::ReadOnly));
    desc.set_enumerable(!(attributes & v8::DontEnum));
    desc.set_configurable(!(attributes & v8::DontDelete));
    desc.set_value(value_obj);

    if (self->IsJSProxy()) {
        ENTER_V8(isolate, context, Object, DefineOwnProperty, Nothing<bool>(),
            i::HandleScope);
        Maybe<bool> success = i::JSReceiver::DefineOwnProperty(
            isolate, self, key_obj, &desc, Just(i::kDontThrow));
        // Even though we said kDontThrow, there might be accessors that do throw.
        RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
        return success;
    } else {
        // If it's not a JSProxy, i::JSReceiver::DefineOwnProperty should never run
        // a script.
        ENTER_V8_NO_SCRIPT(isolate, context, Object, DefineOwnProperty,
            Nothing<bool>(), i::HandleScope);
        Maybe<bool> success = i::JSReceiver::DefineOwnProperty(
            isolate, self, key_obj, &desc, Just(i::kDontThrow));
        RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
        return success;
    }
}

Maybe<bool> v8::Object::DefineProperty(v8::Local<v8::Context> context,
    v8::Local<Name> key,
    PropertyDescriptor& descriptor)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, DefineOwnProperty, Nothing<bool>(),
        i::HandleScope);
    i::Handle<i::JSReceiver> self = Utils::OpenHandle(this);
    i::Handle<i::Name> key_obj = Utils::OpenHandle(*key);

    Maybe<bool> success = i::JSReceiver::DefineOwnProperty(
        isolate, self, key_obj, &descriptor.get_private()->desc,
        Just(i::kDontThrow));
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return success;
}

Maybe<bool> v8::Object::SetPrivate(Local<Context> context, Local<Private> key,
    Local<Value> value)
{
    //auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    i::Isolate* isolate = nullptr;
    if (context.IsEmpty())
        isolate = reinterpret_cast<i::Isolate*>(Isolate::GetCurrent());
    else
        isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());

    ENTER_V8_NO_SCRIPT(isolate, context, Object, SetPrivate, Nothing<bool>(),
        i::HandleScope);
    auto self = Utils::OpenHandle(this);
    auto key_obj = Utils::OpenHandle(reinterpret_cast<Name*>(*key));
    auto value_obj = Utils::OpenHandle(*value);
    if (self->IsJSProxy()) {
        i::PropertyDescriptor desc;
        desc.set_writable(true);
        desc.set_enumerable(false);
        desc.set_configurable(true);
        desc.set_value(value_obj);
        return i::JSProxy::SetPrivateSymbol(
            isolate, i::Handle<i::JSProxy>::cast(self),
            i::Handle<i::Symbol>::cast(key_obj), &desc, Just(i::kDontThrow));
    }
    auto js_object = i::Handle<i::JSObject>::cast(self);
    i::LookupIterator it(js_object, key_obj, js_object);
    has_pending_exception = i::JSObject::DefineOwnPropertyIgnoreAttributes(
        &it, value_obj, i::DONT_ENUM)
                                .is_null();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(true);
}

MaybeLocal<Value> v8::Object::Get(Local<v8::Context> context,
    Local<Value> key)
{
    PREPARE_FOR_EXECUTION(context, Object, Get, Value);
    auto self = Utils::OpenHandle(this);
    auto key_obj = Utils::OpenHandle(*key);
    i::Handle<i::Object> result;
    has_pending_exception = !i::Runtime::GetObjectProperty(isolate, self, key_obj).ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(Utils::ToLocal(result));
}

Local<Value> v8::Object::Get(v8::Local<Value> key)
{
    auto context = ContextFromNeverReadOnlySpaceObject(Utils::OpenHandle(this));
    RETURN_TO_LOCAL_UNCHECKED(Get(context, key), Value);
}

MaybeLocal<Value> v8::Object::Get(Local<Context> context, uint32_t index)
{
    PREPARE_FOR_EXECUTION(context, Object, Get, Value);
    auto self = Utils::OpenHandle(this);
    i::Handle<i::Object> result;
    has_pending_exception = !i::JSReceiver::GetElement(isolate, self, index).ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(Utils::ToLocal(result));
}

Local<Value> v8::Object::Get(uint32_t index)
{
    auto context = ContextFromNeverReadOnlySpaceObject(Utils::OpenHandle(this));
    RETURN_TO_LOCAL_UNCHECKED(Get(context, index), Value);
}

MaybeLocal<Value> v8::Object::GetPrivate(Local<Context> context,
    Local<Private> key)
{
    return Get(context, Local<Value>(reinterpret_cast<Value*>(*key)));
}

Maybe<PropertyAttribute> v8::Object::GetPropertyAttributes(
    Local<Context> context, Local<Value> key)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, GetPropertyAttributes,
        Nothing<PropertyAttribute>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    auto key_obj = Utils::OpenHandle(*key);
    if (!key_obj->IsName()) {
        has_pending_exception = !i::Object::ToString(isolate, key_obj).ToHandle(&key_obj);
        RETURN_ON_FAILED_EXECUTION_PRIMITIVE(PropertyAttribute);
    }
    auto key_name = i::Handle<i::Name>::cast(key_obj);
    auto result = i::JSReceiver::GetPropertyAttributes(self, key_name);
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(PropertyAttribute);
    if (result.FromJust() == i::ABSENT) {
        return Just(static_cast<PropertyAttribute>(i::NONE));
    }
    return Just(static_cast<PropertyAttribute>(result.FromJust()));
}

MaybeLocal<Value> v8::Object::GetOwnPropertyDescriptor(Local<Context> context,
    Local<Name> key)
{
    PREPARE_FOR_EXECUTION(context, Object, GetOwnPropertyDescriptor, Value);
    i::Handle<i::JSReceiver> obj = Utils::OpenHandle(this);
    i::Handle<i::Name> key_name = Utils::OpenHandle(*key);

    i::PropertyDescriptor desc;
    Maybe<bool> found = i::JSReceiver::GetOwnPropertyDescriptor(isolate, obj, key_name, &desc);
    has_pending_exception = found.IsNothing();
    RETURN_ON_FAILED_EXECUTION(Value);
    if (!found.FromJust()) {
        return v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
    }
    RETURN_ESCAPED(Utils::ToLocal(desc.ToObject(isolate)));
}

Local<Value> v8::Object::GetPrototype()
{
    auto isolate = Utils::OpenHandle(this)->GetIsolate();
    auto self = Utils::OpenHandle(this);
    i::PrototypeIterator iter(isolate, self);
    return Utils::ToLocal(i::PrototypeIterator::GetCurrent(iter));
}

Maybe<bool> v8::Object::SetPrototype(Local<Context> context,
    Local<Value> value)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, SetPrototype, Nothing<bool>(),
        i::HandleScope);
    auto self = Utils::OpenHandle(this);
    auto value_obj = Utils::OpenHandle(*value);
    // We do not allow exceptions thrown while setting the prototype
    // to propagate outside.
    TryCatch try_catch(reinterpret_cast<v8::Isolate*>(isolate));
    auto result = i::JSReceiver::SetPrototype(self, value_obj, false, i::kThrowOnError);
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(true);
}

Local<Object> v8::Object::FindInstanceInPrototypeChain(
    v8::Local<FunctionTemplate> tmpl)
{
    auto self = Utils::OpenHandle(this);
    auto isolate = self->GetIsolate();
    i::PrototypeIterator iter(isolate, *self, i::kStartAtReceiver);
    auto tmpl_info = *Utils::OpenHandle(*tmpl);
    while (!tmpl_info->IsTemplateFor(iter.GetCurrent<i::JSObject>())) {
        iter.Advance();
        if (iter.IsAtEnd())
            return Local<Object>();
        if (!iter.GetCurrent()->IsJSObject())
            return Local<Object>();
    }
    // IsTemplateFor() ensures that iter.GetCurrent() can't be a Proxy here.
    return Utils::ToLocal(i::handle(iter.GetCurrent<i::JSObject>(), isolate));
}

MaybeLocal<Array> v8::Object::GetPropertyNames(Local<Context> context)
{
    return GetPropertyNames(
        context, v8::KeyCollectionMode::kIncludePrototypes,
        static_cast<v8::PropertyFilter>(ONLY_ENUMERABLE | SKIP_SYMBOLS),
        v8::IndexFilter::kIncludeIndices);
}

MaybeLocal<Array> v8::Object::GetPropertyNames(
    Local<Context> context, KeyCollectionMode mode,
    PropertyFilter property_filter, IndexFilter index_filter,
    KeyConversionMode key_conversion)
{
    PREPARE_FOR_EXECUTION(context, Object, GetPropertyNames, Array);
    auto self = Utils::OpenHandle(this);
    i::Handle<i::FixedArray> value;
    i::KeyAccumulator accumulator(
        isolate, static_cast<i::KeyCollectionMode>(mode),
        static_cast<i::PropertyFilter>(property_filter));
    accumulator.set_skip_indices(index_filter == IndexFilter::kSkipIndices);
    has_pending_exception = accumulator.CollectKeys(self, self).IsNothing();
    RETURN_ON_FAILED_EXECUTION(Array);
    value = accumulator.GetKeys(static_cast<i::GetKeysConversion>(key_conversion));
    DCHECK(self->map()->EnumLength() == i::kInvalidEnumCacheSentinel || self->map()->EnumLength() == 0 || self->map()->instance_descriptors()->enum_cache()->keys() != *value);
    auto result = isolate->factory()->NewJSArrayWithElements(value);
    RETURN_ESCAPED(Utils::ToLocal(result));
}

MaybeLocal<Array> v8::Object::GetOwnPropertyNames(Local<Context> context)
{
    return GetOwnPropertyNames(
        context, static_cast<v8::PropertyFilter>(ONLY_ENUMERABLE | SKIP_SYMBOLS));
}

MaybeLocal<Array> v8::Object::GetOwnPropertyNames(
    Local<Context> context, PropertyFilter filter,
    KeyConversionMode key_conversion)
{
    return GetPropertyNames(context, KeyCollectionMode::kOwnOnly, filter,
        v8::IndexFilter::kIncludeIndices, key_conversion);
}

MaybeLocal<String> v8::Object::ObjectProtoToString(Local<Context> context)
{
    PREPARE_FOR_EXECUTION(context, Object, ObjectProtoToString, String);
    auto self = Utils::OpenHandle(this);
    Local<Value> result;
    has_pending_exception = !ToLocal<Value>(i::Execution::Call(isolate, isolate->object_to_string(),
                                                self, 0, nullptr),
        &result);
    RETURN_ON_FAILED_EXECUTION(String);
    RETURN_ESCAPED(Local<String>::Cast(result));
}

Local<String> v8::Object::GetConstructorName()
{
    auto self = Utils::OpenHandle(this);
    i::Handle<i::String> name = i::JSReceiver::GetConstructorName(self);
    return Utils::ToLocal(name);
}

Maybe<bool> v8::Object::SetIntegrityLevel(Local<Context> context,
    IntegrityLevel level)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, SetIntegrityLevel, Nothing<bool>(),
        i::HandleScope);
    auto self = Utils::OpenHandle(this);
    i::JSReceiver::IntegrityLevel i_level = level == IntegrityLevel::kFrozen ? i::FROZEN : i::SEALED;
    Maybe<bool> result = i::JSReceiver::SetIntegrityLevel(self, i_level, i::kThrowOnError);
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return result;
}

Maybe<bool> v8::Object::Delete(Local<Context> context, Local<Value> key)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    auto self = Utils::OpenHandle(this);
    auto key_obj = Utils::OpenHandle(*key);
    if (self->IsJSProxy()) {
        ENTER_V8(isolate, context, Object, Delete, Nothing<bool>(), i::HandleScope);
        Maybe<bool> result = i::Runtime::DeleteObjectProperty(
            isolate, self, key_obj, i::LanguageMode::kSloppy);
        has_pending_exception = result.IsNothing();
        RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
        return result;
    } else {
        // If it's not a JSProxy, i::Runtime::DeleteObjectProperty should never run
        // a script.
        ENTER_V8_NO_SCRIPT(isolate, context, Object, Delete, Nothing<bool>(),
            i::HandleScope);
        Maybe<bool> result = i::Runtime::DeleteObjectProperty(
            isolate, self, key_obj, i::LanguageMode::kSloppy);
        has_pending_exception = result.IsNothing();
        RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
        return result;
    }
}

Maybe<bool> v8::Object::DeletePrivate(Local<Context> context,
    Local<Private> key)
{

    i::Isolate* isolate = nullptr;
    if (context.IsEmpty())
        isolate = reinterpret_cast<i::Isolate*>(Isolate::GetCurrent());
    else
        isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    // In case of private symbols, i::Runtime::DeleteObjectProperty does not run
    // any author script.
    ENTER_V8_NO_SCRIPT(isolate, context, Object, Delete, Nothing<bool>(),
        i::HandleScope);

    //   if (IsExecutionTerminatingCheck(isolate))
    //       return Nothing<bool>();
    //
    //   i::HandleScope handle_scope(isolate);
    //   CallDepthScope<false> call_depth_scope(isolate, context);
    //   LOG_API(isolate, Object, Delete);
    //   i::VMState<v8::OTHER> __state__((isolate));
    //   bool has_pending_exception = false;

    auto self = Utils::OpenHandle(this);
    auto key_obj = Utils::OpenHandle(*key);
    Maybe<bool> result = i::Runtime::DeleteObjectProperty(isolate, self, key_obj, i::LanguageMode::kSloppy);
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return result;
}

Maybe<bool> v8::Object::Has(Local<Context> context, Local<Value> key)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, Has, Nothing<bool>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    auto key_obj = Utils::OpenHandle(*key);
    Maybe<bool> maybe = Nothing<bool>();
    // Check if the given key is an array index.
    uint32_t index = 0;
    if (key_obj->ToArrayIndex(&index)) {
        maybe = i::JSReceiver::HasElement(self, index);
    } else {
        // Convert the key to a name - possibly by calling back into JavaScript.
        i::Handle<i::Name> name;
        if (i::Object::ToName(isolate, key_obj).ToHandle(&name)) {
            maybe = i::JSReceiver::HasProperty(self, name);
        }
    }
    has_pending_exception = maybe.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return maybe;
}

Maybe<bool> v8::Object::HasPrivate(Local<Context> context, Local<Private> key)
{
    return HasOwnProperty(context, Local<Name>(reinterpret_cast<Name*>(*key)));
}

Maybe<bool> v8::Object::Delete(Local<Context> context, uint32_t index)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, Delete, Nothing<bool>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    Maybe<bool> result = i::JSReceiver::DeleteElement(self, index);
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return result;
}

Maybe<bool> v8::Object::Has(Local<Context> context, uint32_t index)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, Has, Nothing<bool>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    auto maybe = i::JSReceiver::HasElement(self, index);
    has_pending_exception = maybe.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return maybe;
}

template <typename Getter, typename Setter, typename Data>
static Maybe<bool> ObjectSetAccessor(
    Local<Context> context, Object* self, Local<Name> name, Getter getter,
    Setter setter, Data data, AccessControl settings,
    PropertyAttribute attributes, bool is_special_data_property,
    bool replace_on_access, SideEffectType getter_side_effect_type,
    SideEffectType setter_side_effect_type)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8_NO_SCRIPT(isolate, context, Object, SetAccessor, Nothing<bool>(),
        i::HandleScope);
    if (!Utils::OpenHandle(self)->IsJSObject())
        return Just(false);
    i::Handle<i::JSObject> obj = i::Handle<i::JSObject>::cast(Utils::OpenHandle(self));
    v8::Local<AccessorSignature> signature;
    i::Handle<i::AccessorInfo> info = MakeAccessorInfo(isolate, name, getter, setter, data, settings, signature,
        is_special_data_property, replace_on_access);
    info->set_getter_side_effect_type(getter_side_effect_type);
    info->set_setter_side_effect_type(setter_side_effect_type);
    if (info.is_null())
        return Nothing<bool>();
    bool fast = obj->HasFastProperties();
    i::Handle<i::Object> result;

    i::Handle<i::Name> accessor_name(info->name(), isolate);
    i::PropertyAttributes attrs = static_cast<i::PropertyAttributes>(attributes);
    has_pending_exception = !i::JSObject::SetAccessor(obj, accessor_name, info, attrs)
                                 .ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    if (result->IsUndefined(isolate))
        return Just(false);
    if (fast) {
        i::JSObject::MigrateSlowToFast(obj, 0, "APISetAccessor");
    }
    return Just(true);
}

bool Object::SetAccessor(Local<Name> name,
    AccessorNameGetterCallback getter,
    AccessorNameSetterCallback setter,
    Local<Value> data,
    AccessControl settings,
    PropertyAttribute attribute)
{ // weolar
    base::OS::DebugBreak();
    return false;
}

Maybe<bool> Object::SetAccessor(Local<Context> context, Local<Name> name,
    AccessorNameGetterCallback getter,
    AccessorNameSetterCallback setter,
    MaybeLocal<Value> data, AccessControl settings,
    PropertyAttribute attribute,
    SideEffectType getter_side_effect_type,
    SideEffectType setter_side_effect_type)
{
    return ObjectSetAccessor(context, this, name, getter, setter,
        data.FromMaybe(Local<Value>()), settings, attribute,
        i::FLAG_disable_old_api_accessors, false,
        getter_side_effect_type, setter_side_effect_type);
}

void Object::SetAccessorProperty(Local<Name> name, Local<Function> getter,
    Local<Function> setter,
    PropertyAttribute attribute,
    AccessControl settings)
{
    // TODO(verwaest): Remove |settings|.
    DCHECK_EQ(v8::DEFAULT, settings);
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    auto self = Utils::OpenHandle(this);
    if (!self->IsJSObject())
        return;
    i::Handle<i::Object> getter_i = v8::Utils::OpenHandle(*getter);
    i::Handle<i::Object> setter_i = v8::Utils::OpenHandle(*setter, true);
    if (setter_i.is_null())
        setter_i = isolate->factory()->null_value();
    i::JSObject::DefineAccessor(i::Handle<i::JSObject>::cast(self),
        v8::Utils::OpenHandle(*name), getter_i, setter_i,
        static_cast<i::PropertyAttributes>(attribute));
}

Maybe<bool> Object::SetNativeDataProperty(
    v8::Local<v8::Context> context, v8::Local<Name> name,
    AccessorNameGetterCallback getter, AccessorNameSetterCallback setter,
    v8::Local<Value> data, PropertyAttribute attributes,
    SideEffectType getter_side_effect_type,
    SideEffectType setter_side_effect_type)
{
    return ObjectSetAccessor(context, this, name, getter, setter, data, DEFAULT,
        attributes, true, false, getter_side_effect_type,
        setter_side_effect_type);
}

Maybe<bool> Object::SetLazyDataProperty(
    v8::Local<v8::Context> context, v8::Local<Name> name,
    AccessorNameGetterCallback getter, v8::Local<Value> data,
    PropertyAttribute attributes, SideEffectType getter_side_effect_type,
    SideEffectType setter_side_effect_type)
{
    return ObjectSetAccessor(context, this, name, getter,
        static_cast<AccessorNameSetterCallback>(nullptr),
        data, DEFAULT, attributes, true, true,
        getter_side_effect_type, setter_side_effect_type);
}

Maybe<bool> v8::Object::HasOwnProperty(Local<Context> context,
    Local<Name> key)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, HasOwnProperty, Nothing<bool>(),
        i::HandleScope);
    auto self = Utils::OpenHandle(this);
    auto key_val = Utils::OpenHandle(*key);
    auto result = i::JSReceiver::HasOwnProperty(self, key_val);
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return result;
}

Maybe<bool> v8::Object::HasOwnProperty(Local<Context> context, uint32_t index)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Object, HasOwnProperty, Nothing<bool>(),
        i::HandleScope);
    auto self = Utils::OpenHandle(this);
    auto result = i::JSReceiver::HasOwnProperty(self, index);
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return result;
}

Maybe<bool> v8::Object::HasRealNamedProperty(Local<Context> context,
    Local<Name> key)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8_NO_SCRIPT(isolate, context, Object, HasRealNamedProperty,
        Nothing<bool>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    if (!self->IsJSObject())
        return Just(false);
    auto key_val = Utils::OpenHandle(*key);
    auto result = i::JSObject::HasRealNamedProperty(
        i::Handle<i::JSObject>::cast(self), key_val);
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return result;
}

Maybe<bool> v8::Object::HasRealIndexedProperty(Local<Context> context,
    uint32_t index)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8_NO_SCRIPT(isolate, context, Object, HasRealIndexedProperty,
        Nothing<bool>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    if (!self->IsJSObject())
        return Just(false);
    auto result = i::JSObject::HasRealElementProperty(
        i::Handle<i::JSObject>::cast(self), index);
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return result;
}

Maybe<bool> v8::Object::HasRealNamedCallbackProperty(Local<Context> context,
    Local<Name> key)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8_NO_SCRIPT(isolate, context, Object, HasRealNamedCallbackProperty,
        Nothing<bool>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    if (!self->IsJSObject())
        return Just(false);
    auto key_val = Utils::OpenHandle(*key);
    auto result = i::JSObject::HasRealNamedCallbackProperty(
        i::Handle<i::JSObject>::cast(self), key_val);
    has_pending_exception = result.IsNothing();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return result;
}

bool v8::Object::HasNamedLookupInterceptor()
{
    auto self = Utils::OpenHandle(this);
    return self->IsJSObject() && i::Handle<i::JSObject>::cast(self)->HasNamedInterceptor();
}

bool v8::Object::HasIndexedLookupInterceptor()
{
    auto self = Utils::OpenHandle(this);
    return self->IsJSObject() && i::Handle<i::JSObject>::cast(self)->HasIndexedInterceptor();
}

MaybeLocal<Value> v8::Object::GetRealNamedPropertyInPrototypeChain(
    Local<Context> context, Local<Name> key)
{
    PREPARE_FOR_EXECUTION(context, Object, GetRealNamedPropertyInPrototypeChain,
        Value);
    i::Handle<i::JSReceiver> self = Utils::OpenHandle(this);
    if (!self->IsJSObject())
        return MaybeLocal<Value>();
    i::Handle<i::Name> key_obj = Utils::OpenHandle(*key);
    i::PrototypeIterator iter(isolate, self);
    if (iter.IsAtEnd())
        return MaybeLocal<Value>();
    i::Handle<i::JSReceiver> proto = i::PrototypeIterator::GetCurrent<i::JSReceiver>(iter);
    i::LookupIterator it = i::LookupIterator::PropertyOrElement(
        isolate, self, key_obj, proto,
        i::LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
    Local<Value> result;
    has_pending_exception = !ToLocal<Value>(i::Object::GetProperty(&it), &result);
    RETURN_ON_FAILED_EXECUTION(Value);
    if (!it.IsFound())
        return MaybeLocal<Value>();
    RETURN_ESCAPED(result);
}

Maybe<PropertyAttribute>
v8::Object::GetRealNamedPropertyAttributesInPrototypeChain(
    Local<Context> context, Local<Name> key)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8_NO_SCRIPT(isolate, context, Object,
        GetRealNamedPropertyAttributesInPrototypeChain,
        Nothing<PropertyAttribute>(), i::HandleScope);
    i::Handle<i::JSReceiver> self = Utils::OpenHandle(this);
    if (!self->IsJSObject())
        return Nothing<PropertyAttribute>();
    i::Handle<i::Name> key_obj = Utils::OpenHandle(*key);
    i::PrototypeIterator iter(isolate, self);
    if (iter.IsAtEnd())
        return Nothing<PropertyAttribute>();
    i::Handle<i::JSReceiver> proto = i::PrototypeIterator::GetCurrent<i::JSReceiver>(iter);
    i::LookupIterator it = i::LookupIterator::PropertyOrElement(
        isolate, self, key_obj, proto,
        i::LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
    Maybe<i::PropertyAttributes> result = i::JSReceiver::GetPropertyAttributes(&it);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(PropertyAttribute);
    if (!it.IsFound())
        return Nothing<PropertyAttribute>();
    if (result.FromJust() == i::ABSENT)
        return Just(None);
    return Just(static_cast<PropertyAttribute>(result.FromJust()));
}

MaybeLocal<Value> v8::Object::GetRealNamedProperty(Local<Context> context,
    Local<Name> key)
{
    PREPARE_FOR_EXECUTION(context, Object, GetRealNamedProperty, Value);
    auto self = Utils::OpenHandle(this);
    auto key_obj = Utils::OpenHandle(*key);
    i::LookupIterator it = i::LookupIterator::PropertyOrElement(
        isolate, self, key_obj, self,
        i::LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
    Local<Value> result;
    has_pending_exception = !ToLocal<Value>(i::Object::GetProperty(&it), &result);
    RETURN_ON_FAILED_EXECUTION(Value);
    if (!it.IsFound())
        return MaybeLocal<Value>();
    RETURN_ESCAPED(result);
}

Maybe<PropertyAttribute> v8::Object::GetRealNamedPropertyAttributes(
    Local<Context> context, Local<Name> key)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8_NO_SCRIPT(isolate, context, Object, GetRealNamedPropertyAttributes,
        Nothing<PropertyAttribute>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    auto key_obj = Utils::OpenHandle(*key);
    i::LookupIterator it = i::LookupIterator::PropertyOrElement(
        isolate, self, key_obj, self,
        i::LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
    auto result = i::JSReceiver::GetPropertyAttributes(&it);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(PropertyAttribute);
    if (!it.IsFound())
        return Nothing<PropertyAttribute>();
    if (result.FromJust() == i::ABSENT) {
        return Just(static_cast<PropertyAttribute>(i::NONE));
    }
    return Just<PropertyAttribute>(
        static_cast<PropertyAttribute>(result.FromJust()));
}

Local<v8::Object> v8::Object::Clone()
{
    auto self = i::Handle<i::JSObject>::cast(Utils::OpenHandle(this));
    auto isolate = self->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    auto result = isolate->factory()->CopyJSObject(self);
    CHECK(!result.is_null());
    return Utils::ToLocal(result);
}

Local<v8::Context> v8::Object::CreationContext()
{
    auto self = Utils::OpenHandle(this);
    i::Handle<i::Context> context = self->GetCreationContext();
    return Utils::ToLocal(context);
}

int v8::Object::GetIdentityHash()
{
    i::DisallowHeapAllocation no_gc;
    auto isolate = Utils::OpenHandle(this)->GetIsolate();
    i::HandleScope scope(isolate);
    auto self = Utils::OpenHandle(this);
    return self->GetOrCreateIdentityHash(isolate)->value();
}

bool v8::Object::IsCallable()
{
    auto self = Utils::OpenHandle(this);
    return self->IsCallable();
}

bool v8::Object::IsConstructor()
{
    auto self = Utils::OpenHandle(this);
    return self->IsConstructor();
}

MaybeLocal<Value> Object::CallAsFunction(Local<Context> context,
    Local<Value> recv, int argc,
    Local<Value> argv[])
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.Execute");
    ENTER_V8(isolate, context, Object, CallAsFunction, MaybeLocal<Value>(),
        InternalEscapableScope);
    i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
    auto self = Utils::OpenHandle(this);
    auto recv_obj = Utils::OpenHandle(*recv);
    STATIC_ASSERT(sizeof(v8::Local<v8::Value>) == sizeof(i::Handle<i::Object>));
    i::Handle<i::Object>* args = reinterpret_cast<i::Handle<i::Object>*>(argv);
    Local<Value> result;
    has_pending_exception = !ToLocal<Value>(
        i::Execution::Call(isolate, self, recv_obj, argc, args), &result);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(result);
}

MaybeLocal<Value> Object::CallAsConstructor(Local<Context> context, int argc,
    Local<Value> argv[])
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.Execute");
    ENTER_V8(isolate, context, Object, CallAsConstructor, MaybeLocal<Value>(),
        InternalEscapableScope);
    i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
    auto self = Utils::OpenHandle(this);
    STATIC_ASSERT(sizeof(v8::Local<v8::Value>) == sizeof(i::Handle<i::Object>));
    i::Handle<i::Object>* args = reinterpret_cast<i::Handle<i::Object>*>(argv);
    Local<Value> result;
    has_pending_exception = !ToLocal<Value>(
        i::Execution::New(isolate, self, self, argc, args), &result);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(result);
}

MaybeLocal<Function> Function::New(Local<Context> context,
    FunctionCallback callback, Local<Value> data,
    int length, ConstructorBehavior behavior,
    SideEffectType side_effect_type)
{
    i::Isolate* isolate = Utils::OpenHandle(*context)->GetIsolate();
    LOG_API(isolate, Function, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    auto templ = FunctionTemplateNew(isolate, callback, data, Local<Signature>(), length,
        true, Local<Private>(), side_effect_type);
    if (behavior == ConstructorBehavior::kThrow)
        templ->RemovePrototype();
    return templ->GetFunction(context);
}

MaybeLocal<Object> Function::NewInstance(Local<Context> context, int argc,
    v8::Local<v8::Value> argv[]) const
{
    return NewInstanceWithSideEffectType(context, argc, argv,
        SideEffectType::kHasSideEffect);
}

MaybeLocal<Object> Function::NewInstanceWithSideEffectType(
    Local<Context> context, int argc, v8::Local<v8::Value> argv[],
    SideEffectType side_effect_type) const
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.Execute");
    ENTER_V8(isolate, context, Function, NewInstance, MaybeLocal<Object>(),
        InternalEscapableScope);
    i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
    auto self = Utils::OpenHandle(this);
    STATIC_ASSERT(sizeof(v8::Local<v8::Value>) == sizeof(i::Handle<i::Object>));
    bool should_set_has_no_side_effect = side_effect_type == SideEffectType::kHasNoSideEffect && isolate->debug_execution_mode() == i::DebugInfo::kSideEffects;
    if (should_set_has_no_side_effect) {
        CHECK(self->IsJSFunction() && i::JSFunction::cast(*self)->shared()->IsApiFunction());
        i::Object obj = i::JSFunction::cast(*self)->shared()->get_api_func_data()->call_code();
        if (obj->IsCallHandlerInfo()) {
            i::CallHandlerInfo handler_info = i::CallHandlerInfo::cast(obj);
            if (!handler_info->IsSideEffectFreeCallHandlerInfo()) {
                handler_info->SetNextCallHasNoSideEffect();
            }
        }
    }
    i::Handle<i::Object>* args = reinterpret_cast<i::Handle<i::Object>*>(argv);
    Local<Object> result;
    has_pending_exception = !ToLocal<Object>(
        i::Execution::New(isolate, self, self, argc, args), &result);
    if (should_set_has_no_side_effect) {
        i::Object obj = i::JSFunction::cast(*self)->shared()->get_api_func_data()->call_code();
        if (obj->IsCallHandlerInfo()) {
            i::CallHandlerInfo handler_info = i::CallHandlerInfo::cast(obj);
            if (has_pending_exception) {
                // Restore the map if an exception prevented restoration.
                handler_info->NextCallHasNoSideEffect();
            } else {
                DCHECK(handler_info->IsSideEffectCallHandlerInfo() || handler_info->IsSideEffectFreeCallHandlerInfo());
            }
        }
    }
    RETURN_ON_FAILED_EXECUTION(Object);
    RETURN_ESCAPED(result);
}

MaybeLocal<v8::Value> Function::Call(Local<Context> context,
    v8::Local<v8::Value> recv, int argc,
    v8::Local<v8::Value> argv[])
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.Execute");
    ENTER_V8(isolate, context, Function, Call, MaybeLocal<Value>(),
        InternalEscapableScope);
    i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
    auto self = Utils::OpenHandle(this);
    Utils::ApiCheck(!self.is_null(), "v8::Function::Call",
        "Function to be called is a null pointer");
    i::Handle<i::Object> recv_obj = Utils::OpenHandle(*recv);
    STATIC_ASSERT(sizeof(v8::Local<v8::Value>) == sizeof(i::Handle<i::Object>));
    i::Handle<i::Object>* args = reinterpret_cast<i::Handle<i::Object>*>(argv);
    Local<Value> result;
    has_pending_exception = !ToLocal<Value>(
        i::Execution::Call(isolate, self, recv_obj, argc, args), &result);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(result);
}

void Function::SetName(v8::Local<v8::String> name)
{
    auto self = Utils::OpenHandle(this);
    if (!self->IsJSFunction())
        return;
    auto func = i::Handle<i::JSFunction>::cast(self);
    func->shared()->SetName(*Utils::OpenHandle(*name));
}

Local<Value> Function::GetName() const
{
    auto self = Utils::OpenHandle(this);
    i::Isolate* isolate = self->GetIsolate();
    if (self->IsJSBoundFunction()) {
        auto func = i::Handle<i::JSBoundFunction>::cast(self);
        i::Handle<i::Object> name;
        ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, name,
            i::JSBoundFunction::GetName(isolate, func),
            Local<Value>());
        return Utils::ToLocal(name);
    }
    if (self->IsJSFunction()) {
        auto func = i::Handle<i::JSFunction>::cast(self);
        return Utils::ToLocal(handle(func->shared()->Name(), isolate));
    }
    return ToApiHandle<Primitive>(isolate->factory()->undefined_value());
}

Local<Value> Function::GetInferredName() const
{
    auto self = Utils::OpenHandle(this);
    if (!self->IsJSFunction()) {
        return ToApiHandle<Primitive>(
            self->GetIsolate()->factory()->undefined_value());
    }
    auto func = i::Handle<i::JSFunction>::cast(self);
    return Utils::ToLocal(i::Handle<i::Object>(func->shared()->inferred_name(),
        func->GetIsolate()));
}

Local<Value> Function::GetDebugName() const
{
    auto self = Utils::OpenHandle(this);
    if (!self->IsJSFunction()) {
        return ToApiHandle<Primitive>(
            self->GetIsolate()->factory()->undefined_value());
    }
    auto func = i::Handle<i::JSFunction>::cast(self);
    i::Handle<i::String> name = i::JSFunction::GetDebugName(func);
    return Utils::ToLocal(i::Handle<i::Object>(*name, self->GetIsolate()));
}

Local<Value> Function::GetDisplayName() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    auto self = Utils::OpenHandle(this);
    if (!self->IsJSFunction()) {
        return ToApiHandle<Primitive>(isolate->factory()->undefined_value());
    }
    auto func = i::Handle<i::JSFunction>::cast(self);
    i::Handle<i::String> property_name = isolate->factory()->NewStringFromStaticChars("displayName");
    i::Handle<i::Object> value = i::JSReceiver::GetDataProperty(func, property_name);
    if (value->IsString()) {
        i::Handle<i::String> name = i::Handle<i::String>::cast(value);
        if (name->length() > 0)
            return Utils::ToLocal(name);
    }
    return ToApiHandle<Primitive>(isolate->factory()->undefined_value());
}

ScriptOrigin Function::GetScriptOrigin() const
{
    auto self = Utils::OpenHandle(this);
    if (!self->IsJSFunction()) {
        return v8::ScriptOrigin(Local<Value>());
    }
    auto func = i::Handle<i::JSFunction>::cast(self);
    if (func->shared()->script()->IsScript()) {
        i::Handle<i::Script> script(i::Script::cast(func->shared()->script()),
            func->GetIsolate());
        return GetScriptOriginForScript(func->GetIsolate(), script);
    }
    return v8::ScriptOrigin(Local<Value>());
}

const int Function::kLineOffsetNotFound = -1;

int Function::GetScriptLineNumber() const
{
    auto self = Utils::OpenHandle(this);
    if (!self->IsJSFunction()) {
        return kLineOffsetNotFound;
    }
    auto func = i::Handle<i::JSFunction>::cast(self);
    if (func->shared()->script()->IsScript()) {
        i::Handle<i::Script> script(i::Script::cast(func->shared()->script()),
            func->GetIsolate());
        return i::Script::GetLineNumber(script, func->shared()->StartPosition());
    }
    return kLineOffsetNotFound;
}

int Function::GetScriptColumnNumber() const
{
    auto self = Utils::OpenHandle(this);
    if (!self->IsJSFunction()) {
        return kLineOffsetNotFound;
    }
    auto func = i::Handle<i::JSFunction>::cast(self);
    if (func->shared()->script()->IsScript()) {
        i::Handle<i::Script> script(i::Script::cast(func->shared()->script()),
            func->GetIsolate());
        return i::Script::GetColumnNumber(script, func->shared()->StartPosition());
    }
    return kLineOffsetNotFound;
}

int Function::ScriptId() const
{
    auto self = Utils::OpenHandle(this);
    if (!self->IsJSFunction()) {
        return v8::UnboundScript::kNoScriptId;
    }
    auto func = i::Handle<i::JSFunction>::cast(self);
    if (!func->shared()->script()->IsScript()) {
        return v8::UnboundScript::kNoScriptId;
    }
    i::Handle<i::Script> script(i::Script::cast(func->shared()->script()),
        func->GetIsolate());
    return script->id();
}

Local<v8::Value> Function::GetBoundFunction() const
{
    auto self = Utils::OpenHandle(this);
    if (self->IsJSBoundFunction()) {
        auto bound_function = i::Handle<i::JSBoundFunction>::cast(self);
        auto bound_target_function = i::handle(
            bound_function->bound_target_function(), bound_function->GetIsolate());
        return Utils::CallableToLocal(bound_target_function);
    }
    return v8::Undefined(reinterpret_cast<v8::Isolate*>(self->GetIsolate()));
}

int Name::GetIdentityHash()
{
    auto self = Utils::OpenHandle(this);
    return static_cast<int>(self->Hash());
}

int String::Length() const
{
    i::Handle<i::String> str = Utils::OpenHandle(this);
    return str->length();
}

bool String::IsOneByte() const
{
    i::Handle<i::String> str = Utils::OpenHandle(this);
    return str->IsOneByteRepresentation();
}

// Helpers for ContainsOnlyOneByteHelper
template <size_t size>
struct OneByteMask;
template <>
struct OneByteMask<4> {
    static const uint32_t value = 0xFF00FF00;
};
template <>
struct OneByteMask<8> {
    static const uint64_t value = V8_2PART_UINT64_C(0xFF00FF00, FF00FF00);
};
static const uintptr_t kOneByteMask = OneByteMask<sizeof(uintptr_t)>::value;
static const uintptr_t kAlignmentMask = sizeof(uintptr_t) - 1;
static inline bool Unaligned(const uint16_t* chars)
{
    return reinterpret_cast<const uintptr_t>(chars) & kAlignmentMask;
}

static inline const uint16_t* Align(const uint16_t* chars)
{
    return reinterpret_cast<uint16_t*>(
        reinterpret_cast<uintptr_t>(chars) & ~kAlignmentMask);
}

class ContainsOnlyOneByteHelper {
public:
    ContainsOnlyOneByteHelper()
        : is_one_byte_(true)
    {
    }
    bool Check(i::String string)
    {
        i::ConsString cons_string = i::String::VisitFlat(this, string, 0);
        if (cons_string.is_null())
            return is_one_byte_;
        return CheckCons(cons_string);
    }
    void VisitOneByteString(const uint8_t* chars, int length)
    {
        // Nothing to do.
    }
    void VisitTwoByteString(const uint16_t* chars, int length)
    {
        // Accumulated bits.
        uintptr_t acc = 0;
        // Align to uintptr_t.
        const uint16_t* end = chars + length;
        while (Unaligned(chars) && chars != end) {
            acc |= *chars++;
        }
        // Read word aligned in blocks,
        // checking the return value at the end of each block.
        const uint16_t* aligned_end = Align(end);
        const int increment = sizeof(uintptr_t) / sizeof(uint16_t);
        const int inner_loops = 16;
        while (chars + inner_loops * increment < aligned_end) {
            for (int i = 0; i < inner_loops; i++) {
                acc |= *reinterpret_cast<const uintptr_t*>(chars);
                chars += increment;
            }
            // Check for early return.
            if ((acc & kOneByteMask) != 0) {
                is_one_byte_ = false;
                return;
            }
        }
        // Read the rest.
        while (chars != end) {
            acc |= *chars++;
        }
        // Check result.
        if ((acc & kOneByteMask) != 0)
            is_one_byte_ = false;
    }

private:
    bool CheckCons(i::ConsString cons_string)
    {
        while (true) {
            // Check left side if flat.
            i::String left = cons_string->first();
            i::ConsString left_as_cons = i::String::VisitFlat(this, left, 0);
            if (!is_one_byte_)
                return false;
            // Check right side if flat.
            i::String right = cons_string->second();
            i::ConsString right_as_cons = i::String::VisitFlat(this, right, 0);
            if (!is_one_byte_)
                return false;
            // Standard recurse/iterate trick.
            if (!left_as_cons.is_null() && !right_as_cons.is_null()) {
                if (left->length() < right->length()) {
                    CheckCons(left_as_cons);
                    cons_string = right_as_cons;
                } else {
                    CheckCons(right_as_cons);
                    cons_string = left_as_cons;
                }
                // Check fast return.
                if (!is_one_byte_)
                    return false;
                continue;
            }
            // Descend left in place.
            if (!left_as_cons.is_null()) {
                cons_string = left_as_cons;
                continue;
            }
            // Descend right in place.
            if (!right_as_cons.is_null()) {
                cons_string = right_as_cons;
                continue;
            }
            // Terminate.
            break;
        }
        return is_one_byte_;
    }
    bool is_one_byte_;
    DISALLOW_COPY_AND_ASSIGN(ContainsOnlyOneByteHelper);
};

bool String::ContainsOnlyOneByte() const
{
    i::Handle<i::String> str = Utils::OpenHandle(this);
    if (str->IsOneByteRepresentation())
        return true;
    ContainsOnlyOneByteHelper helper;
    return helper.Check(*str);
}

int String::Utf8Length(Isolate* isolate) const
{
    i::Handle<i::String> str = Utils::OpenHandle(this);
    str = i::String::Flatten(reinterpret_cast<i::Isolate*>(isolate), str);
    int length = str->length();
    if (length == 0)
        return 0;
    i::DisallowHeapAllocation no_gc;
    i::String::FlatContent flat = str->GetFlatContent(no_gc);
    DCHECK(flat.IsFlat());
    int utf8_length = 0;
    if (flat.IsOneByte()) {
        for (uint8_t c : flat.ToOneByteVector()) {
            utf8_length += c >> 7;
        }
        utf8_length += length;
    } else {
        int last_character = unibrow::Utf16::kNoPreviousCharacter;
        for (uint16_t c : flat.ToUC16Vector()) {
            utf8_length += unibrow::Utf8::Length(c, last_character);
            last_character = c;
        }
    }
    return utf8_length;
}

namespace {
    // Writes the flat content of a string to a buffer. This is done in two phases.
    // The first phase calculates a pessimistic estimate (writable_length) on how
    // many code units can be safely written without exceeding the buffer capacity
    // and without leaving at a lone surrogate. The estimated number of code units
    // is then written out in one go, and the reported byte usage is used to
    // correct the estimate. This is repeated until the estimate becomes <= 0 or
    // all code units have been written out. The second phase writes out code
    // units until the buffer capacity is reached, would be exceeded by the next
    // unit, or all code units have been written out.
    template <typename Char>
    static int WriteUtf8Impl(i::Vector<const Char> string, char* write_start,
        int write_capacity, int options,
        int* utf16_chars_read_out)
    {
        bool write_null = !(options & v8::String::NO_NULL_TERMINATION);
        bool replace_invalid_utf8 = (options & v8::String::REPLACE_INVALID_UTF8);
        char* current_write = write_start;
        const Char* read_start = string.start();
        int read_index = 0;
        int read_length = string.length();
        int prev_char = unibrow::Utf16::kNoPreviousCharacter;
        // Do a fast loop where there is no exit capacity check.
        // Need enough space to write everything but one character.
        STATIC_ASSERT(unibrow::Utf16::kMaxExtraUtf8BytesForOneUtf16CodeUnit == 3);
        static const int kMaxSizePerChar = sizeof(Char) == 1 ? 2 : 3;
        while (read_index < read_length) {
            int up_to = read_length;
            if (write_capacity != -1) {
                int remaining_capacity = write_capacity - static_cast<int>(current_write - write_start);
                int writable_length = (remaining_capacity - kMaxSizePerChar) / kMaxSizePerChar;
                // Need to drop into slow loop.
                if (writable_length <= 0)
                    break;
                up_to = std::min(up_to, read_index + writable_length);
            }
            // Write the characters to the stream.
            if (sizeof(Char) == 1) {
                // Simply memcpy if we only have ASCII characters.
                uint8_t char_mask = 0;
                for (int i = read_index; i < up_to; i++)
                    char_mask |= read_start[i];
                if ((char_mask & 0x80) == 0) {
                    int copy_length = up_to - read_index;
                    memcpy(current_write, read_start + read_index, copy_length);
                    current_write += copy_length;
                    read_index = up_to;
                } else {
                    for (; read_index < up_to; read_index++) {
                        current_write += unibrow::Utf8::EncodeOneByte(
                            current_write, static_cast<uint8_t>(read_start[read_index]));
                        DCHECK(write_capacity == -1 || (current_write - write_start) <= write_capacity);
                    }
                }
            } else {
                for (; read_index < up_to; read_index++) {
                    uint16_t character = read_start[read_index];
                    current_write += unibrow::Utf8::Encode(current_write, character,
                        prev_char, replace_invalid_utf8);
                    prev_char = character;
                    DCHECK(write_capacity == -1 || (current_write - write_start) <= write_capacity);
                }
            }
        }
        if (read_index < read_length) {
            DCHECK_NE(-1, write_capacity);
            // Aborted due to limited capacity. Check capacity on each iteration.
            int remaining_capacity = write_capacity - static_cast<int>(current_write - write_start);
            DCHECK_GE(remaining_capacity, 0);
            for (; read_index < read_length && remaining_capacity > 0; read_index++) {
                uint32_t character = read_start[read_index];
                int written = 0;
                // We can't use a local buffer here because Encode needs to modify
                // previous characters in the stream.  We know, however, that
                // exactly one character will be advanced.
                if (unibrow::Utf16::IsSurrogatePair(prev_char, character)) {
                    written = unibrow::Utf8::Encode(current_write, character, prev_char,
                        replace_invalid_utf8);
                    DCHECK_EQ(written, 1);
                } else {
                    // Use a scratch buffer to check the required characters.
                    char temp_buffer[unibrow::Utf8::kMaxEncodedSize];
                    // Encoding a surrogate pair to Utf8 always takes 4 bytes.
                    static const int kSurrogatePairEncodedSize = static_cast<int>(unibrow::Utf8::kMaxEncodedSize);
                    // For REPLACE_INVALID_UTF8, catch the case where we cut off in the
                    // middle of a surrogate pair. Abort before encoding the pair instead.
                    if (replace_invalid_utf8 && remaining_capacity < kSurrogatePairEncodedSize && unibrow::Utf16::IsLeadSurrogate(character) && read_index + 1 < read_length && unibrow::Utf16::IsTrailSurrogate(read_start[read_index + 1])) {
                        write_null = false;
                        break;
                    }
                    // Can't encode using prev_char as gcc has array bounds issues.
                    written = unibrow::Utf8::Encode(temp_buffer, character,
                        unibrow::Utf16::kNoPreviousCharacter,
                        replace_invalid_utf8);
                    if (written > remaining_capacity) {
                        // Won't fit. Abort and do not null-terminate the result.
                        write_null = false;
                        break;
                    }
                    // Copy over the character from temp_buffer.
                    for (int i = 0; i < written; i++)
                        current_write[i] = temp_buffer[i];
                }

                current_write += written;
                remaining_capacity -= written;
                prev_char = character;
            }
        }

        // Write out number of utf16 characters written to the stream.
        if (utf16_chars_read_out != nullptr)
            *utf16_chars_read_out = read_index;

        // Only null-terminate if there's space.
        if (write_null && (write_capacity == -1 || (current_write - write_start) < write_capacity)) {
            *current_write++ = '\0';
        }
        return static_cast<int>(current_write - write_start);
    }
} // anonymous namespace

int String::WriteUtf8(Isolate* v8_isolate, char* buffer, int capacity,
    int* nchars_ref, int options) const
{
    i::Handle<i::String> str = Utils::OpenHandle(this);
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    LOG_API(isolate, String, WriteUtf8);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    str = i::String::Flatten(isolate, str);
    i::DisallowHeapAllocation no_gc;
    i::String::FlatContent content = str->GetFlatContent(no_gc);
    if (content.IsOneByte()) {
        return WriteUtf8Impl<uint8_t>(content.ToOneByteVector(), buffer, capacity,
            options, nchars_ref);
    } else {
        return WriteUtf8Impl<uint16_t>(content.ToUC16Vector(), buffer, capacity,
            options, nchars_ref);
    }
}

template <typename CharType>
static inline int WriteHelper(i::Isolate* isolate, const String* string,
    CharType* buffer, int start, int length,
    int options)
{
    LOG_API(isolate, String, Write);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    DCHECK(start >= 0 && length >= -1);
    i::Handle<i::String> str = Utils::OpenHandle(string);
    str = i::String::Flatten(isolate, str);
    int end = start + length;
    if ((length == -1) || (length > str->length() - start))
        end = str->length();
    if (end < 0)
        return 0;
    i::String::WriteToFlat(*str, buffer, start, end);
    if (!(options & String::NO_NULL_TERMINATION) && (length == -1 || end - start < length)) {
        buffer[end - start] = '\0';
    }
    return end - start;
}

int String::WriteOneByte(Isolate* isolate, uint8_t* buffer, int start,
    int length, int options) const
{
    return WriteHelper(reinterpret_cast<i::Isolate*>(isolate), this, buffer,
        start, length, options);
}

int String::Write(Isolate* isolate, uint16_t* buffer, int start, int length,
    int options) const
{
    return WriteHelper(reinterpret_cast<i::Isolate*>(isolate), this, buffer,
        start, length, options);
}

bool v8::String::IsExternal() const
{
    i::Handle<i::String> str = Utils::OpenHandle(this);
    return i::StringShape(*str).IsExternalTwoByte();
}

bool v8::String::IsExternalOneByte() const
{
    i::Handle<i::String> str = Utils::OpenHandle(this);
    return i::StringShape(*str).IsExternalOneByte();
}

void v8::String::VerifyExternalStringResource(
    v8::String::ExternalStringResource* value) const
{
    i::DisallowHeapAllocation no_allocation;
    i::String str = *Utils::OpenHandle(this);
    const v8::String::ExternalStringResource* expected;

    if (str->IsThinString()) {
        str = i::ThinString::cast(str)->actual();
    }

    if (i::StringShape(str).IsExternalTwoByte()) {
        const void* resource = i::ExternalTwoByteString::cast(str)->resource();
        expected = reinterpret_cast<const ExternalStringResource*>(resource);
    } else {
        expected = nullptr;
    }
    CHECK_EQ(expected, value);
}

void v8::String::VerifyExternalStringResourceBase(
    v8::String::ExternalStringResourceBase* value, Encoding encoding) const
{
    i::DisallowHeapAllocation no_allocation;
    i::String str = *Utils::OpenHandle(this);
    const v8::String::ExternalStringResourceBase* expected;
    Encoding expectedEncoding;

    if (str->IsThinString()) {
        str = i::ThinString::cast(str)->actual();
    }

    if (i::StringShape(str).IsExternalOneByte()) {
        const void* resource = i::ExternalOneByteString::cast(str)->resource();
        expected = reinterpret_cast<const ExternalStringResourceBase*>(resource);
        expectedEncoding = ONE_BYTE_ENCODING;
    } else if (i::StringShape(str).IsExternalTwoByte()) {
        const void* resource = i::ExternalTwoByteString::cast(str)->resource();
        expected = reinterpret_cast<const ExternalStringResourceBase*>(resource);
        expectedEncoding = TWO_BYTE_ENCODING;
    } else {
        expected = nullptr;
        expectedEncoding = str->IsOneByteRepresentation() ? ONE_BYTE_ENCODING : TWO_BYTE_ENCODING;
    }
    CHECK_EQ(expected, value);
    CHECK_EQ(expectedEncoding, encoding);
}

String::ExternalStringResource* String::GetExternalStringResourceSlow() const
{
    i::DisallowHeapAllocation no_allocation;
    typedef internal::Internals I;
    i::String str = *Utils::OpenHandle(this);

    if (str->IsThinString()) {
        str = i::ThinString::cast(str)->actual();
    }

    if (i::StringShape(str).IsExternalTwoByte()) {
        void* value = I::ReadRawField<void*>(str.ptr(), I::kStringResourceOffset);
        return reinterpret_cast<String::ExternalStringResource*>(value);
    }
    return nullptr;
}

String::ExternalStringResourceBase* String::GetExternalStringResourceBaseSlow(
    String::Encoding* encoding_out) const
{
    i::DisallowHeapAllocation no_allocation;
    typedef internal::Internals I;
    ExternalStringResourceBase* resource = nullptr;
    i::String str = *Utils::OpenHandle(this);

    if (str->IsThinString()) {
        str = i::ThinString::cast(str)->actual();
    }

    internal::Address string = str.ptr();
    int type = I::GetInstanceType(string) & I::kFullStringRepresentationMask;
    *encoding_out = static_cast<Encoding>(type & I::kStringEncodingMask);
    if (i::StringShape(str).IsExternalOneByte() || i::StringShape(str).IsExternalTwoByte()) {
        void* value = I::ReadRawField<void*>(string, I::kStringResourceOffset);
        resource = static_cast<ExternalStringResourceBase*>(value);
    }
    return resource;
}

const v8::String::ExternalOneByteStringResource*
v8::String::GetExternalOneByteStringResource() const
{
    i::DisallowHeapAllocation no_allocation;
    i::String str = *Utils::OpenHandle(this);
    if (i::StringShape(str).IsExternalOneByte()) {
        return i::ExternalOneByteString::cast(str)->resource();
    } else if (str->IsThinString()) {
        str = i::ThinString::cast(str)->actual();
        if (i::StringShape(str).IsExternalOneByte()) {
            return i::ExternalOneByteString::cast(str)->resource();
        }
    }
    return nullptr;
}

Local<Value> Symbol::Name() const
{
    i::Handle<i::Symbol> sym = Utils::OpenHandle(this);

    i::Isolate* isolate;
    if (!i::GetIsolateFromWritableObject(*sym, &isolate)) {
        // If the Symbol is in RO_SPACE, then its name must be too. Since RO_SPACE
        // objects are immovable we can use the Handle(Address*) constructor with
        // the address of the name field in the Symbol object without needing an
        // isolate.
#ifdef V8_COMPRESS_POINTERS
        // Compressed fields can't serve as handle locations.
        // TODO(ishell): get Isolate as a parameter.
        isolate = i::Isolate::Current();
#else
        i::Handle<i::HeapObject> ro_name(reinterpret_cast<i::Address*>(
            sym->GetFieldAddress(i::Symbol::kNameOffset)));
        return Utils::ToLocal(ro_name);
#endif
    }

    i::Handle<i::Object> name(sym->name(), isolate);

    return Utils::ToLocal(name);
}

Local<Value> Private::Name() const
{
    return reinterpret_cast<const Symbol*>(this)->Name();
}

double Number::Value() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    return obj->Number();
}

bool Boolean::Value() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    return obj->IsTrue();
}

int64_t Integer::Value() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsSmi()) {
        return i::Smi::ToInt(*obj);
    } else {
        return static_cast<int64_t>(obj->Number());
    }
}

int32_t Int32::Value() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsSmi()) {
        return i::Smi::ToInt(*obj);
    } else {
        return static_cast<int32_t>(obj->Number());
    }
}

uint32_t Uint32::Value() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    if (obj->IsSmi()) {
        return i::Smi::ToInt(*obj);
    } else {
        return static_cast<uint32_t>(obj->Number());
    }
}

int v8::Object::InternalFieldCount()
{
    i::Handle<i::JSReceiver> self = Utils::OpenHandle(this);
    if (!self->IsJSObject())
        return 0;
    return i::Handle<i::JSObject>::cast(self)->GetEmbedderFieldCount();
}

static bool InternalFieldOK(i::Handle<i::JSReceiver> obj, int index,
    const char* location)
{
    return Utils::ApiCheck(
        obj->IsJSObject() && (index < i::Handle<i::JSObject>::cast(obj)->GetEmbedderFieldCount()),
        location, "Internal field out of bounds");
}

Local<Value> v8::Object::SlowGetInternalField(int index)
{
    i::Handle<i::JSReceiver> obj = Utils::OpenHandle(this);
    const char* location = "v8::Object::GetInternalField()";
    if (!InternalFieldOK(obj, index, location))
        return Local<Value>();
    i::Handle<i::Object> value(i::JSObject::cast(*obj)->GetEmbedderField(index),
        obj->GetIsolate());
    return Utils::ToLocal(value);
}

void v8::Object::SetInternalField(int index, v8::Local<Value> value)
{
    i::Handle<i::JSReceiver> obj = Utils::OpenHandle(this);
    const char* location = "v8::Object::SetInternalField()";
    if (!InternalFieldOK(obj, index, location))
        return;
    i::Handle<i::Object> val = Utils::OpenHandle(*value);
    i::Handle<i::JSObject>::cast(obj)->SetEmbedderField(index, *val);
}

void* v8::Object::SlowGetAlignedPointerFromInternalField(int index)
{
    i::Handle<i::JSReceiver> obj = Utils::OpenHandle(this);
    const char* location = "v8::Object::GetAlignedPointerFromInternalField()";
    if (!InternalFieldOK(obj, index, location))
        return nullptr;
    void* result;
    Utils::ApiCheck(i::EmbedderDataSlot(i::JSObject::cast(*obj), index)
                        .ToAlignedPointer(&result),
        location, "Unaligned pointer");
    return result;
}

void v8::Object::SetAlignedPointerInInternalField(int index, void* value)
{
    i::Handle<i::JSReceiver> obj = Utils::OpenHandle(this);
    const char* location = "v8::Object::SetAlignedPointerInInternalField()";
    if (!InternalFieldOK(obj, index, location))
        return;
    Utils::ApiCheck(i::EmbedderDataSlot(i::JSObject::cast(*obj), index)
                        .store_aligned_pointer(value),
        location, "Unaligned pointer");
    DCHECK_EQ(value, GetAlignedPointerFromInternalField(index));
}

void v8::Object::SetAlignedPointerInInternalFields(int argc, int indices[],
    void* values[])
{
    i::Handle<i::JSReceiver> obj = Utils::OpenHandle(this);
    const char* location = "v8::Object::SetAlignedPointerInInternalFields()";
    i::DisallowHeapAllocation no_gc;
    i::JSObject js_obj = i::JSObject::cast(*obj);
    int nof_embedder_fields = js_obj->GetEmbedderFieldCount();
    for (int i = 0; i < argc; i++) {
        int index = indices[i];
        if (!Utils::ApiCheck(index < nof_embedder_fields, location,
                "Internal field out of bounds")) {
            return;
        }
        void* value = values[i];
        Utils::ApiCheck(
            i::EmbedderDataSlot(js_obj, index).store_aligned_pointer(value),
            location, "Unaligned pointer");
        DCHECK_EQ(value, GetAlignedPointerFromInternalField(index));
    }
}

static void* ExternalValue(i::Object obj)
{
    // Obscure semantics for undefined, but somehow checked in our unit tests...
    if (obj->IsUndefined()) {
        return nullptr;
    }
    i::Object foreign = i::JSObject::cast(obj)->GetEmbedderField(0);
    return reinterpret_cast<void*>(i::Foreign::cast(foreign)->foreign_address());
}

// --- E n v i r o n m e n t ---

void v8::V8::InitializePlatform(Platform* platform)
{
    i::V8::InitializePlatform(platform);
}

void v8::V8::ShutdownPlatform()
{
    i::V8::ShutdownPlatform();
}

bool v8::V8::Initialize()
{
    i::V8::Initialize();
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
    i::ReadNatives();
#endif
    return true;
}

#if V8_OS_LINUX || V8_OS_MACOSX
bool TryHandleWebAssemblyTrapPosix(int sig_code, siginfo_t* info,
    void* context)
{
#if V8_TARGET_ARCH_X64 && !V8_OS_ANDROID
    return i::trap_handler::TryHandleSignal(sig_code, info, context);
#else
    return false;
#endif
}

bool V8::TryHandleSignal(int signum, void* info, void* context)
{
    return TryHandleWebAssemblyTrapPosix(
        signum, reinterpret_cast<siginfo_t*>(info), context);
}
#endif

#if V8_OS_WIN
bool TryHandleWebAssemblyTrapWindows(EXCEPTION_POINTERS* exception)
{
#if V8_TARGET_ARCH_X64
    return i::trap_handler::TryHandleWasmTrap(exception);
#endif
    return false;
}
#endif

bool V8::EnableWebAssemblyTrapHandler(bool use_v8_signal_handler)
{
    return v8::internal::trap_handler::EnableTrapHandler(use_v8_signal_handler);
}

#if defined(V8_OS_WIN)
// void V8::SetUnhandledExceptionCallback(UnhandledExceptionCallback unhandled_exception_callback) {
// #if defined(V8_TARGET_ARCH_X64)
//   v8::internal::win64_unwindinfo::SetUnhandledExceptionCallback(
//       unhandled_exception_callback);
// #else
//   // Not implemented on ARM64.
// #endif
// }
#endif

void v8::V8::SetEntropySource(EntropySource entropy_source)
{
    base::RandomNumberGenerator::SetEntropySource(entropy_source);
}

void v8::V8::SetReturnAddressLocationResolver(
    ReturnAddressLocationResolver return_address_resolver)
{
    i::StackFrame::SetReturnAddressLocationResolver(return_address_resolver);
}

bool v8::V8::Dispose()
{
    i::V8::TearDown();
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
    i::DisposeNatives();
#endif
    return true;
}

HeapStatistics::HeapStatistics()
    : total_heap_size_(0)
    , total_heap_size_executable_(0)
    , total_physical_size_(0)
    , total_available_size_(0)
    , used_heap_size_(0)
    , heap_size_limit_(0)
    , malloced_memory_(0)
    , external_memory_(0)
    , peak_malloced_memory_(0)
    , does_zap_garbage_(false)
    , number_of_native_contexts_(0)
    , number_of_detached_contexts_(0)
{
}

HeapSpaceStatistics::HeapSpaceStatistics()
    : space_name_(nullptr)
    , space_size_(0)
    , space_used_size_(0)
    , space_available_size_(0)
    , physical_space_size_(0)
{
}

HeapObjectStatistics::HeapObjectStatistics()
    : object_type_(nullptr)
    , object_sub_type_(nullptr)
    , object_count_(0)
    , object_size_(0)
{
}

HeapCodeStatistics::HeapCodeStatistics()
    : code_and_metadata_size_(0)
    , bytecode_and_metadata_size_(0)
    , external_script_source_size_(0)
{
}

bool v8::V8::InitializeICU(const char* icu_data_file)
{
    return i::InitializeICU(icu_data_file);
}

bool v8::V8::InitializeICUDefaultLocation(const char* exec_path,
    const char* icu_data_file)
{
    return i::InitializeICUDefaultLocation(exec_path, icu_data_file);
}

void v8::V8::InitializeExternalStartupData(const char* directory_path)
{
    i::InitializeExternalStartupData(directory_path);
}

void v8::V8::InitializeExternalStartupData(const char* natives_blob,
    const char* snapshot_blob)
{
    i::InitializeExternalStartupData(natives_blob, snapshot_blob);
}

const char* v8::V8::GetVersion()
{
    return i::Version::GetVersion();
}

template <typename ObjectType>
struct InvokeBootstrapper;

template <>
struct InvokeBootstrapper<i::Context> {
    i::Handle<i::Context> Invoke(
        i::Isolate* isolate, i::MaybeHandle<i::JSGlobalProxy> maybe_global_proxy,
        v8::Local<v8::ObjectTemplate> global_proxy_template,
        v8::ExtensionConfiguration* extensions, size_t context_snapshot_index,
        v8::DeserializeInternalFieldsCallback embedder_fields_deserializer,
        v8::MicrotaskQueue* microtask_queue)
    {
        return isolate->bootstrapper()->CreateEnvironment(
            maybe_global_proxy, global_proxy_template, extensions,
            context_snapshot_index, embedder_fields_deserializer, microtask_queue);
    }
};

template <>
struct InvokeBootstrapper<i::JSGlobalProxy> {
    i::Handle<i::JSGlobalProxy> Invoke(
        i::Isolate* isolate, i::MaybeHandle<i::JSGlobalProxy> maybe_global_proxy,
        v8::Local<v8::ObjectTemplate> global_proxy_template,
        v8::ExtensionConfiguration* extensions, size_t context_snapshot_index,
        v8::DeserializeInternalFieldsCallback embedder_fields_deserializer,
        v8::MicrotaskQueue* microtask_queue)
    {
        USE(extensions);
        USE(context_snapshot_index);
        return isolate->bootstrapper()->NewRemoteContext(maybe_global_proxy,
            global_proxy_template);
    }
};

template <typename ObjectType>
static i::Handle<ObjectType> CreateEnvironment(
    i::Isolate* isolate, v8::ExtensionConfiguration* extensions,
    v8::MaybeLocal<ObjectTemplate> maybe_global_template,
    v8::MaybeLocal<Value> maybe_global_proxy, size_t context_snapshot_index,
    v8::DeserializeInternalFieldsCallback embedder_fields_deserializer,
    v8::MicrotaskQueue* microtask_queue)
{
    i::Handle<ObjectType> result;

    {
        ENTER_V8_FOR_NEW_CONTEXT(isolate);
        v8::Local<ObjectTemplate> proxy_template;
        i::Handle<i::FunctionTemplateInfo> proxy_constructor;
        i::Handle<i::FunctionTemplateInfo> global_constructor;
        i::Handle<i::Object> named_interceptor(
            isolate->factory()->undefined_value());
        i::Handle<i::Object> indexed_interceptor(
            isolate->factory()->undefined_value());

        if (!maybe_global_template.IsEmpty()) {
            v8::Local<v8::ObjectTemplate> global_template = maybe_global_template.ToLocalChecked();
            // Make sure that the global_template has a constructor.
            global_constructor = EnsureConstructor(isolate, *global_template);

            // Create a fresh template for the global proxy object.
            proxy_template = ObjectTemplate::New(
                reinterpret_cast<v8::Isolate*>(isolate));
            proxy_constructor = EnsureConstructor(isolate, *proxy_template);

            // Set the global template to be the prototype template of
            // global proxy template.
            i::FunctionTemplateInfo::SetPrototypeTemplate(
                isolate, proxy_constructor, Utils::OpenHandle(*global_template));

            proxy_template->SetInternalFieldCount(
                global_template->InternalFieldCount());

            // Migrate security handlers from global_template to
            // proxy_template.  Temporarily removing access check
            // information from the global template.
            if (!global_constructor->GetAccessCheckInfo()->IsUndefined(isolate)) {
                i::FunctionTemplateInfo::SetAccessCheckInfo(
                    isolate, proxy_constructor,
                    i::handle(global_constructor->GetAccessCheckInfo(), isolate));
                proxy_constructor->set_needs_access_check(
                    global_constructor->needs_access_check());
                global_constructor->set_needs_access_check(false);
                i::FunctionTemplateInfo::SetAccessCheckInfo(
                    isolate, global_constructor,
                    i::ReadOnlyRoots(isolate).undefined_value_handle());
            }

            // Same for other interceptors. If the global constructor has
            // interceptors, we need to replace them temporarily with noop
            // interceptors, so the map is correctly marked as having interceptors,
            // but we don't invoke any.
            if (!global_constructor->GetNamedPropertyHandler()->IsUndefined(
                    isolate)) {
                named_interceptor = handle(global_constructor->GetNamedPropertyHandler(), isolate);
                i::FunctionTemplateInfo::SetNamedPropertyHandler(
                    isolate, global_constructor,
                    i::ReadOnlyRoots(isolate).noop_interceptor_info_handle());
            }
            if (!global_constructor->GetIndexedPropertyHandler()->IsUndefined(
                    isolate)) {
                indexed_interceptor = handle(global_constructor->GetIndexedPropertyHandler(), isolate);
                i::FunctionTemplateInfo::SetIndexedPropertyHandler(
                    isolate, global_constructor,
                    i::ReadOnlyRoots(isolate).noop_interceptor_info_handle());
            }
        }

        i::MaybeHandle<i::JSGlobalProxy> maybe_proxy;
        if (!maybe_global_proxy.IsEmpty()) {
            maybe_proxy = i::Handle<i::JSGlobalProxy>::cast(
                Utils::OpenHandle(*maybe_global_proxy.ToLocalChecked()));
        }
        // Create the environment.
        InvokeBootstrapper<ObjectType> invoke;
        result = invoke.Invoke(isolate, maybe_proxy, proxy_template, extensions,
            context_snapshot_index, embedder_fields_deserializer,
            microtask_queue);

        // Restore the access check info and interceptors on the global template.
        if (!maybe_global_template.IsEmpty()) {
            DCHECK(!global_constructor.is_null());
            DCHECK(!proxy_constructor.is_null());
            i::FunctionTemplateInfo::SetAccessCheckInfo(
                isolate, global_constructor,
                i::handle(proxy_constructor->GetAccessCheckInfo(), isolate));
            global_constructor->set_needs_access_check(
                proxy_constructor->needs_access_check());
            i::FunctionTemplateInfo::SetNamedPropertyHandler(
                isolate, global_constructor, named_interceptor);
            i::FunctionTemplateInfo::SetIndexedPropertyHandler(
                isolate, global_constructor, indexed_interceptor);
        }
    }
    // Leave V8.

    return result;
}

Local<Context> NewContext(
    v8::Isolate* external_isolate, v8::ExtensionConfiguration* extensions,
    v8::MaybeLocal<ObjectTemplate> global_template,
    v8::MaybeLocal<Value> global_object, size_t context_snapshot_index,
    v8::DeserializeInternalFieldsCallback embedder_fields_deserializer,
    v8::MicrotaskQueue* microtask_queue)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(external_isolate);
    // TODO(jkummerow): This is for crbug.com/713699. Remove it if it doesn't
    // fail.
    // Sanity-check that the isolate is initialized and usable.
    CHECK(isolate->builtins()->builtin(i::Builtins::kIllegal)->IsCode());

    TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.NewContext");
    LOG_API(isolate, Context, New);
    i::HandleScope scope(isolate);
    ExtensionConfiguration no_extensions;
    if (extensions == nullptr)
        extensions = &no_extensions;
    i::Handle<i::Context> env = CreateEnvironment<i::Context>(
        isolate, extensions, global_template, global_object,
        context_snapshot_index, embedder_fields_deserializer, microtask_queue);
    if (env.is_null()) {
        if (isolate->has_pending_exception())
            isolate->clear_pending_exception();
        return Local<Context>();
    }
    return Utils::ToLocal(scope.CloseAndEscape(env));
}

Local<Context> v8::Context::New(
    v8::Isolate* external_isolate, v8::ExtensionConfiguration* extensions,
    v8::MaybeLocal<ObjectTemplate> global_template,
    v8::MaybeLocal<Value> global_object,
    DeserializeInternalFieldsCallback internal_fields_deserializer,
    v8::MicrotaskQueue* microtask_queue)
{
    return NewContext(external_isolate, extensions, global_template,
        global_object, 0, internal_fields_deserializer,
        microtask_queue);
}

MaybeLocal<Context> v8::Context::FromSnapshot(
    v8::Isolate* external_isolate, size_t context_snapshot_index,
    v8::DeserializeInternalFieldsCallback embedder_fields_deserializer,
    v8::ExtensionConfiguration* extensions, MaybeLocal<Value> global_object,
    v8::MicrotaskQueue* microtask_queue)
{
    size_t index_including_default_context = context_snapshot_index + 1;
    if (!i::Snapshot::HasContextSnapshot(
            reinterpret_cast<i::Isolate*>(external_isolate),
            index_including_default_context)) {
        return MaybeLocal<Context>();
    }
    return NewContext(external_isolate, extensions, MaybeLocal<ObjectTemplate>(),
        global_object, index_including_default_context,
        embedder_fields_deserializer, microtask_queue);
}

MaybeLocal<Object> v8::Context::NewRemoteContext(
    v8::Isolate* external_isolate, v8::Local<ObjectTemplate> global_template,
    v8::MaybeLocal<v8::Value> global_object)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(external_isolate);
    LOG_API(isolate, Context, NewRemoteContext);
    i::HandleScope scope(isolate);
    i::Handle<i::FunctionTemplateInfo> global_constructor = EnsureConstructor(isolate, *global_template);
    Utils::ApiCheck(global_constructor->needs_access_check(),
        "v8::Context::NewRemoteContext",
        "Global template needs to have access checks enabled.");
    i::Handle<i::AccessCheckInfo> access_check_info = i::handle(
        i::AccessCheckInfo::cast(global_constructor->GetAccessCheckInfo()),
        isolate);
    Utils::ApiCheck(access_check_info->named_interceptor() != i::Object(),
        "v8::Context::NewRemoteContext",
        "Global template needs to have access check handlers.");
    i::Handle<i::JSObject> global_proxy = CreateEnvironment<i::JSGlobalProxy>(
        isolate, nullptr, global_template, global_object, 0,
        DeserializeInternalFieldsCallback(), nullptr);
    if (global_proxy.is_null()) {
        if (isolate->has_pending_exception())
            isolate->clear_pending_exception();
        return MaybeLocal<Object>();
    }
    return Utils::ToLocal(scope.CloseAndEscape(global_proxy));
}

void v8::Context::SetSecurityToken(Local<Value> token)
{
    i::Handle<i::Context> env = Utils::OpenHandle(this);
    i::Handle<i::Object> token_handle = Utils::OpenHandle(*token);
    env->set_security_token(*token_handle);
}

void v8::Context::UseDefaultSecurityToken()
{
    i::Handle<i::Context> env = Utils::OpenHandle(this);
    env->set_security_token(env->global_object());
}

Local<Value> v8::Context::GetSecurityToken()
{
    i::Handle<i::Context> env = Utils::OpenHandle(this);
    i::Isolate* isolate = env->GetIsolate();
    i::Object security_token = env->security_token();
    i::Handle<i::Object> token_handle(security_token, isolate);
    return Utils::ToLocal(token_handle);
}

v8::Isolate* Context::GetIsolate()
{
    i::Handle<i::Context> env = Utils::OpenHandle(this);
    return reinterpret_cast<Isolate*>(env->GetIsolate());
}

v8::Local<v8::Object> Context::Global()
{
    i::Handle<i::Context> context = Utils::OpenHandle(this);
    i::Isolate* isolate = context->GetIsolate();
    i::Handle<i::Object> global(context->global_proxy(), isolate);
    // TODO(dcarney): This should always return the global proxy
    // but can't presently as calls to GetProtoype will return the wrong result.
    if (i::Handle<i::JSGlobalProxy>::cast(
            global)
            ->IsDetachedFrom(context->global_object())) {
        global = i::Handle<i::Object>(context->global_object(), isolate);
    }
    return Utils::ToLocal(i::Handle<i::JSObject>::cast(global));
}

void Context::DetachGlobal()
{
    i::Handle<i::Context> context = Utils::OpenHandle(this);
    i::Isolate* isolate = context->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    isolate->bootstrapper()->DetachGlobal(context);
}

Local<v8::Object> Context::GetExtrasBindingObject()
{
    i::Handle<i::Context> context = Utils::OpenHandle(this);
    i::Isolate* isolate = context->GetIsolate();
    i::Handle<i::JSObject> binding(context->extras_binding_object(), isolate);
    return Utils::ToLocal(binding);
}

void Context::AllowCodeGenerationFromStrings(bool allow)
{
    i::Handle<i::Context> context = Utils::OpenHandle(this);
    i::Isolate* isolate = context->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    context->set_allow_code_gen_from_strings(
        allow ? i::ReadOnlyRoots(isolate).true_value()
              : i::ReadOnlyRoots(isolate).false_value());
}

bool Context::IsCodeGenerationFromStringsAllowed()
{
    i::Handle<i::Context> context = Utils::OpenHandle(this);
    return !context->allow_code_gen_from_strings()->IsFalse(
        context->GetIsolate());
}

void Context::SetErrorMessageForCodeGenerationFromStrings(Local<String> error)
{
    i::Handle<i::Context> context = Utils::OpenHandle(this);
    i::Handle<i::String> error_handle = Utils::OpenHandle(*error);
    context->set_error_message_for_code_gen_from_strings(*error_handle);
}

namespace {
    i::Address* GetSerializedDataFromFixedArray(i::Isolate* isolate,
        i::FixedArray list, size_t index)
    {
        if (index < static_cast<size_t>(list->length())) {
            int int_index = static_cast<int>(index);
            i::Object object = list->get(int_index);
            if (!object->IsTheHole(isolate)) {
                list->set_the_hole(isolate, int_index);
                // Shrink the list so that the last element is not the hole (unless it's
                // the first element, because we don't want to end up with a non-canonical
                // empty FixedArray).
                int last = list->length() - 1;
                while (last >= 0 && list->is_the_hole(isolate, last))
                    last--;
                if (last != -1)
                    list->Shrink(isolate, last + 1);
                return i::Handle<i::Object>(object, isolate).location();
            }
        }
        return nullptr;
    }
} // anonymous namespace

i::Address* Context::GetDataFromSnapshotOnce(size_t index)
{
    auto context = Utils::OpenHandle(this);
    i::Isolate* i_isolate = context->GetIsolate();
    i::FixedArray list = context->serialized_objects();
    return GetSerializedDataFromFixedArray(i_isolate, list, index);
}

MaybeLocal<v8::Object> ObjectTemplate::NewInstance(Local<Context> context)
{
    PREPARE_FOR_EXECUTION(context, ObjectTemplate, NewInstance, Object);
    auto self = Utils::OpenHandle(this);
    Local<Object> result;
    has_pending_exception = !ToLocal<Object>(
        i::ApiNatives::InstantiateObject(isolate, self), &result);
    RETURN_ON_FAILED_EXECUTION(Object);
    RETURN_ESCAPED(result);
}

void v8::ObjectTemplate::CheckCast(Data* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsObjectTemplateInfo(), "v8::ObjectTemplate::Cast",
        "Could not convert to object template");
}

void v8::FunctionTemplate::CheckCast(Data* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsFunctionTemplateInfo(), "v8::FunctionTemplate::Cast",
        "Could not convert to function template");
}

void v8::Signature::CheckCast(Data* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsFunctionTemplateInfo(), "v8::Signature::Cast",
        "Could not convert to signature");
}

void v8::AccessorSignature::CheckCast(Data* that)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(that);
    Utils::ApiCheck(obj->IsFunctionTemplateInfo(), "v8::AccessorSignature::Cast",
        "Could not convert to accessor signature");
}

MaybeLocal<v8::Function> FunctionTemplate::GetFunction(Local<Context> context)
{
    PREPARE_FOR_EXECUTION(context, FunctionTemplate, GetFunction, Function);
    auto self = Utils::OpenHandle(this);
    Local<Function> result;
    has_pending_exception = !ToLocal<Function>(i::ApiNatives::InstantiateFunction(self), &result);
    RETURN_ON_FAILED_EXECUTION(Function);
    RETURN_ESCAPED(result);
}

MaybeLocal<v8::Object> FunctionTemplate::NewRemoteInstance()
{
    auto self = Utils::OpenHandle(this);
    i::Isolate* isolate = self->GetIsolate();
    LOG_API(isolate, FunctionTemplate, NewRemoteInstance);
    i::HandleScope scope(isolate);
    i::Handle<i::FunctionTemplateInfo> constructor = EnsureConstructor(isolate, *InstanceTemplate());
    Utils::ApiCheck(constructor->needs_access_check(),
        "v8::FunctionTemplate::NewRemoteInstance",
        "InstanceTemplate needs to have access checks enabled.");
    i::Handle<i::AccessCheckInfo> access_check_info = i::handle(
        i::AccessCheckInfo::cast(constructor->GetAccessCheckInfo()), isolate);
    Utils::ApiCheck(access_check_info->named_interceptor() != i::Object(),
        "v8::FunctionTemplate::NewRemoteInstance",
        "InstanceTemplate needs to have access check handlers.");
    i::Handle<i::JSObject> object;
    if (!i::ApiNatives::InstantiateRemoteObject(
            Utils::OpenHandle(*InstanceTemplate()))
             .ToHandle(&object)) {
        if (isolate->has_pending_exception()) {
            isolate->OptionalRescheduleException(true);
        }
        return MaybeLocal<Object>();
    }
    return Utils::ToLocal(scope.CloseAndEscape(object));
}

bool FunctionTemplate::HasInstance(v8::Local<v8::Value> value)
{
    auto self = Utils::OpenHandle(this);
    auto obj = Utils::OpenHandle(*value);
    if (obj->IsJSObject() && self->IsTemplateFor(i::JSObject::cast(*obj))) {
        return true;
    }
    if (obj->IsJSGlobalProxy()) {
        // If it's a global proxy, then test with the global object. Note that the
        // inner global object may not necessarily be a JSGlobalObject.
        i::PrototypeIterator iter(self->GetIsolate(),
            i::JSObject::cast(*obj)->map());
        // The global proxy should always have a prototype, as it is a bug to call
        // this on a detached JSGlobalProxy.
        DCHECK(!iter.IsAtEnd());
        return self->IsTemplateFor(iter.GetCurrent<i::JSObject>());
    }
    return false;
}

Local<External> v8::External::New(Isolate* isolate, void* value)
{
    STATIC_ASSERT(sizeof(value) == sizeof(i::Address));
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, External, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::JSObject> external = i_isolate->factory()->NewExternal(value);
    return Utils::ExternalToLocal(external);
}

void* External::Value() const
{
    return ExternalValue(*Utils::OpenHandle(this));
}

// anonymous namespace for string creation helper functions
namespace {

    inline int StringLength(const char* string)
    {
        return i::StrLength(string);
    }

    inline int StringLength(const uint8_t* string)
    {
        return i::StrLength(reinterpret_cast<const char*>(string));
    }

    inline int StringLength(const uint16_t* string)
    {
        int length = 0;
        while (string[length] != '\0')
            length++;
        return length;
    }

    V8_WARN_UNUSED_RESULT
    inline i::MaybeHandle<i::String> NewString(i::Factory* factory,
        v8::NewStringType type,
        i::Vector<const char> string)
    {
        if (type == v8::NewStringType::kInternalized) {
            return factory->InternalizeUtf8String(string);
        }
        return factory->NewStringFromUtf8(string);
    }

    V8_WARN_UNUSED_RESULT
    inline i::MaybeHandle<i::String> NewString(i::Factory* factory,
        v8::NewStringType type,
        i::Vector<const uint8_t> string)
    {
        if (type == v8::NewStringType::kInternalized) {
            return factory->InternalizeOneByteString(string);
        }
        return factory->NewStringFromOneByte(string);
    }

    V8_WARN_UNUSED_RESULT
    inline i::MaybeHandle<i::String> NewString(i::Factory* factory,
        v8::NewStringType type,
        i::Vector<const uint16_t> string)
    {
        if (type == v8::NewStringType::kInternalized) {
            return factory->InternalizeTwoByteString(string);
        }
        return factory->NewStringFromTwoByte(string);
    }

    STATIC_ASSERT(v8::String::kMaxLength == i::String::kMaxLength);

} // anonymous namespace

// TODO(dcarney): throw a context free exception.
#define NEW_STRING(isolate, class_name, function_name, Char, data, type,           \
    length)                                                                        \
    MaybeLocal<String> result;                                                     \
    if (length == 0) {                                                             \
        result = String::Empty(isolate);                                           \
    } else if (length > i::String::kMaxLength) {                                   \
        result = MaybeLocal<String>();                                             \
    } else {                                                                       \
        i::Isolate* i_isolate = reinterpret_cast<internal::Isolate*>(isolate);     \
        ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);                                \
        LOG_API(i_isolate, class_name, function_name);                             \
        if (length < 0)                                                            \
            length = StringLength(data);                                           \
        i::Handle<i::String> handle_result = NewString(i_isolate->factory(), type, \
            i::Vector<const Char>(data, length))                                   \
                                                 .ToHandleChecked();               \
        result = Utils::ToLocal(handle_result);                                    \
    }

Local<String> String::NewFromUtf8(Isolate* isolate,
    const char* data,
    NewStringType type,
    int length)
{
    NEW_STRING(isolate, String, NewFromUtf8, char, data,
        static_cast<v8::NewStringType>(type), length);
    RETURN_TO_LOCAL_UNCHECKED(result, String);
}

MaybeLocal<String> String::NewFromUtf8(Isolate* isolate, const char* data,
    v8::NewStringType type, int length)
{
    NEW_STRING(isolate, String, NewFromUtf8, char, data, type, length);
    return result;
}

MaybeLocal<String> String::NewFromOneByte(Isolate* isolate, const uint8_t* data,
    v8::NewStringType type, int length)
{
    NEW_STRING(isolate, String, NewFromOneByte, uint8_t, data, type, length);
    return result;
}

Local<String> String::NewFromTwoByte(Isolate* isolate,
    const uint16_t* data,
    NewStringType type,
    int length)
{
    NEW_STRING(isolate, String, NewFromTwoByte, uint16_t, data,
        static_cast<v8::NewStringType>(type), length);
    RETURN_TO_LOCAL_UNCHECKED(result, String);
}

MaybeLocal<String> String::NewFromTwoByte(Isolate* isolate,
    const uint16_t* data,
    v8::NewStringType type, int length)
{
    NEW_STRING(isolate, String, NewFromTwoByte, uint16_t, data, type, length);
    return result;
}

Local<String> v8::String::Concat(Isolate* v8_isolate, Local<String> left,
    Local<String> right)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    i::Handle<i::String> left_string = Utils::OpenHandle(*left);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    LOG_API(isolate, String, Concat);
    i::Handle<i::String> right_string = Utils::OpenHandle(*right);
    // If we are steering towards a range error, do not wait for the error to be
    // thrown, and return the null handle instead.
    if (left_string->length() + right_string->length() > i::String::kMaxLength) {
        return Local<String>();
    }
    i::Handle<i::String> result = isolate->factory()->NewConsString(
                                                        left_string, right_string)
                                      .ToHandleChecked();
    return Utils::ToLocal(result);
}

MaybeLocal<String> v8::String::NewExternalTwoByte(
    Isolate* isolate, v8::String::ExternalStringResource* resource)
{
    CHECK(resource && resource->data());
    // TODO(dcarney): throw a context free exception.
    if (resource->length() > static_cast<size_t>(i::String::kMaxLength)) {
        return MaybeLocal<String>();
    }
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    LOG_API(i_isolate, String, NewExternalTwoByte);
    if (resource->length() > 0) {
        i::Handle<i::String> string = i_isolate->factory()
                                          ->NewExternalStringFromTwoByte(resource)
                                          .ToHandleChecked();
        return Utils::ToLocal(string);
    } else {
        // The resource isn't going to be used, free it immediately.
        resource->Dispose();
        return Utils::ToLocal(i_isolate->factory()->empty_string());
    }
}

MaybeLocal<String> v8::String::NewExternalOneByte(
    Isolate* isolate, v8::String::ExternalOneByteStringResource* resource)
{
    CHECK(resource && resource->data());
    // TODO(dcarney): throw a context free exception.
    if (resource->length() > static_cast<size_t>(i::String::kMaxLength)) {
        return MaybeLocal<String>();
    }
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    LOG_API(i_isolate, String, NewExternalOneByte);
    if (resource->length() > 0) {
        i::Handle<i::String> string = i_isolate->factory()
                                          ->NewExternalStringFromOneByte(resource)
                                          .ToHandleChecked();
        return Utils::ToLocal(string);
    } else {
        // The resource isn't going to be used, free it immediately.
        resource->Dispose();
        return Utils::ToLocal(i_isolate->factory()->empty_string());
    }
}

Local<String> v8::String::NewExternal(
    Isolate* isolate, v8::String::ExternalOneByteStringResource* resource)
{
    RETURN_TO_LOCAL_UNCHECKED(NewExternalOneByte(isolate, resource), String);
}

bool v8::String::MakeExternal(v8::String::ExternalStringResource* resource)
{
    i::DisallowHeapAllocation no_allocation;

    i::String obj = *Utils::OpenHandle(this);

    if (obj->IsThinString()) {
        obj = i::ThinString::cast(obj)->actual();
    }

    if (!obj->SupportsExternalization()) {
        return false;
    }

    // It is safe to call GetIsolateFromWritableHeapObject because
    // SupportsExternalization already checked that the object is writable.
    i::Isolate* isolate;
    i::GetIsolateFromWritableObject(obj, &isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);

    CHECK(resource && resource->data());

    bool result = obj->MakeExternal(resource);
    DCHECK(result);
    DCHECK(obj->IsExternalString());
    return result;
}

bool v8::String::MakeExternal(
    v8::String::ExternalOneByteStringResource* resource)
{
    i::DisallowHeapAllocation no_allocation;

    i::String obj = *Utils::OpenHandle(this);

    if (obj->IsThinString()) {
        obj = i::ThinString::cast(obj)->actual();
    }

    if (!obj->SupportsExternalization()) {
        return false;
    }

    // It is safe to call GetIsolateFromWritableHeapObject because
    // SupportsExternalization already checked that the object is writable.
    i::Isolate* isolate;
    i::GetIsolateFromWritableObject(obj, &isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);

    CHECK(resource && resource->data());

    bool result = obj->MakeExternal(resource);
    DCHECK_IMPLIES(result, obj->IsExternalString());
    return result;
}

bool v8::String::CanMakeExternal()
{
    i::DisallowHeapAllocation no_allocation;
    i::String obj = *Utils::OpenHandle(this);

    if (obj->IsThinString()) {
        obj = i::ThinString::cast(obj)->actual();
    }

    if (!obj->SupportsExternalization()) {
        return false;
    }

    // Only old space strings should be externalized.
    return !i::Heap::InYoungGeneration(obj);
}

bool v8::String::StringEquals(Local<String> that)
{
    auto self = Utils::OpenHandle(this);
    auto other = Utils::OpenHandle(*that);
    return self->Equals(*other);
}

Isolate* v8::Object::GetIsolate()
{
    i::Isolate* i_isolate = Utils::OpenHandle(this)->GetIsolate();
    return reinterpret_cast<Isolate*>(i_isolate);
}

Local<v8::Object> v8::Object::New(Isolate* isolate)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, Object, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::JSObject> obj = i_isolate->factory()->NewJSObject(i_isolate->object_function());
    return Utils::ToLocal(obj);
}

Local<v8::Object> v8::Object::New(Isolate* isolate,
    Local<Value> prototype_or_null,
    Local<Name>* names, Local<Value>* values,
    size_t length)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::Handle<i::Object> proto = Utils::OpenHandle(*prototype_or_null);
    if (!Utils::ApiCheck(proto->IsNull() || proto->IsJSReceiver(),
            "v8::Object::New", "prototype must be null or object")) {
        return Local<v8::Object>();
    }
    LOG_API(i_isolate, Object, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);

    // We assume that this API is mostly used to create objects with named
    // properties, and so we default to creating a properties backing store
    // large enough to hold all of them, while we start with no elements
    // (see http://bit.ly/v8-fast-object-create-cpp for the motivation).
    i::Handle<i::NameDictionary> properties = i::NameDictionary::New(i_isolate, static_cast<int>(length));
    i::Handle<i::FixedArrayBase> elements = i_isolate->factory()->empty_fixed_array();
    for (size_t i = 0; i < length; ++i) {
        i::Handle<i::Name> name = Utils::OpenHandle(*names[i]);
        i::Handle<i::Object> value = Utils::OpenHandle(*values[i]);

        // See if the {name} is a valid array index, in which case we need to
        // add the {name}/{value} pair to the {elements}, otherwise they end
        // up in the {properties} backing store.
        uint32_t index;
        if (name->AsArrayIndex(&index)) {
            // If this is the first element, allocate a proper
            // dictionary elements backing store for {elements}.
            if (!elements->IsNumberDictionary()) {
                elements = i::NumberDictionary::New(i_isolate, static_cast<int>(length));
            }
            elements = i::NumberDictionary::Set(
                i_isolate, i::Handle<i::NumberDictionary>::cast(elements), index,
                value);
        } else {
            // Internalize the {name} first.
            name = i_isolate->factory()->InternalizeName(name);
            int const entry = properties->FindEntry(i_isolate, name);
            if (entry == i::NameDictionary::kNotFound) {
                // Add the {name}/{value} pair as a new entry.
                properties = i::NameDictionary::Add(i_isolate, properties, name, value,
                    i::PropertyDetails::Empty());
            } else {
                // Overwrite the {entry} with the {value}.
                properties->ValueAtPut(entry, *value);
            }
        }
    }
    i::Handle<i::JSObject> obj = i_isolate->factory()->NewSlowJSObjectWithPropertiesAndElements(
        i::Handle<i::HeapObject>::cast(proto), properties, elements);
    return Utils::ToLocal(obj);
}

Local<v8::Value> v8::NumberObject::New(Isolate* isolate, double value)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, NumberObject, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::Object> number = i_isolate->factory()->NewNumber(value);
    i::Handle<i::Object> obj = i::Object::ToObject(i_isolate, number).ToHandleChecked();
    return Utils::ToLocal(obj);
}

double v8::NumberObject::ValueOf() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
    i::Isolate* isolate = jsvalue->GetIsolate();
    LOG_API(isolate, NumberObject, NumberValue);
    return jsvalue->value()->Number();
}

Local<v8::Value> v8::BigIntObject::New(Isolate* isolate, int64_t value)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, BigIntObject, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::Object> bigint = i::BigInt::FromInt64(i_isolate, value);
    i::Handle<i::Object> obj = i::Object::ToObject(i_isolate, bigint).ToHandleChecked();
    return Utils::ToLocal(obj);
}

Local<v8::BigInt> v8::BigIntObject::ValueOf() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
    i::Isolate* isolate = jsvalue->GetIsolate();
    LOG_API(isolate, BigIntObject, BigIntValue);
    return Utils::ToLocal(
        i::Handle<i::BigInt>(i::BigInt::cast(jsvalue->value()), isolate));
}

Local<v8::Value> v8::BooleanObject::New(Isolate* isolate, bool value)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, BooleanObject, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::Object> boolean(value
            ? i::ReadOnlyRoots(i_isolate).true_value()
            : i::ReadOnlyRoots(i_isolate).false_value(),
        i_isolate);
    i::Handle<i::Object> obj = i::Object::ToObject(i_isolate, boolean).ToHandleChecked();
    return Utils::ToLocal(obj);
}

bool v8::BooleanObject::ValueOf() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
    i::Isolate* isolate = jsvalue->GetIsolate();
    LOG_API(isolate, BooleanObject, BooleanValue);
    return jsvalue->value()->IsTrue(isolate);
}

Local<v8::Value> v8::StringObject::New(Isolate* v8_isolate,
    Local<String> value)
{
    i::Handle<i::String> string = Utils::OpenHandle(*value);
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    LOG_API(isolate, StringObject, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::Handle<i::Object> obj = i::Object::ToObject(isolate, string).ToHandleChecked();
    return Utils::ToLocal(obj);
}

Local<v8::String> v8::StringObject::ValueOf() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
    i::Isolate* isolate = jsvalue->GetIsolate();
    LOG_API(isolate, StringObject, StringValue);
    return Utils::ToLocal(
        i::Handle<i::String>(i::String::cast(jsvalue->value()), isolate));
}

Local<v8::Value> v8::SymbolObject::New(Isolate* isolate, Local<Symbol> value)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, SymbolObject, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::Object> obj = i::Object::ToObject(
        i_isolate, Utils::OpenHandle(*value))
                                   .ToHandleChecked();
    return Utils::ToLocal(obj);
}

Local<v8::Symbol> v8::SymbolObject::ValueOf() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::JSValue> jsvalue = i::Handle<i::JSValue>::cast(obj);
    i::Isolate* isolate = jsvalue->GetIsolate();
    LOG_API(isolate, SymbolObject, SymbolValue);
    return Utils::ToLocal(
        i::Handle<i::Symbol>(i::Symbol::cast(jsvalue->value()), isolate));
}

MaybeLocal<v8::Value> v8::Date::New(Local<Context> context, double time)
{
    if (/*std::*/isnan(time)) {
        // Introduce only canonical NaN value into the VM, to avoid signaling NaNs.
        time = std::numeric_limits<double>::quiet_NaN();
    }
    PREPARE_FOR_EXECUTION(context, Date, New, Value);
    Local<Value> result;
    has_pending_exception = !ToLocal<Value>(
        i::JSDate::New(isolate->date_function(), isolate->date_function(), time),
        &result);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(result);
}

double v8::Date::ValueOf() const
{
    i::Handle<i::Object> obj = Utils::OpenHandle(this);
    i::Handle<i::JSDate> jsdate = i::Handle<i::JSDate>::cast(obj);
    i::Isolate* isolate = jsdate->GetIsolate();
    LOG_API(isolate, Date, NumberValue);
    return jsdate->value()->Number();
}

// Assert that the static TimeZoneDetection cast in
// DateTimeConfigurationChangeNotification is valid.
#define TIME_ZONE_DETECTION_ASSERT_EQ(value)                                                                                         \
    STATIC_ASSERT(                                                                                                                   \
        static_cast<int>(v8::Isolate::TimeZoneDetection::value) == static_cast<int>(base::TimezoneCache::TimeZoneDetection::value)); \
    STATIC_ASSERT(static_cast<int>(v8::Isolate::TimeZoneDetection::value) == static_cast<int>(v8::Date::TimeZoneDetection::value));
TIME_ZONE_DETECTION_ASSERT_EQ(kSkip)
TIME_ZONE_DETECTION_ASSERT_EQ(kRedetect)
#undef TIME_ZONE_DETECTION_ASSERT_EQ

// static
void v8::Date::DateTimeConfigurationChangeNotification(
    Isolate* isolate, TimeZoneDetection time_zone_detection)
{
    isolate->DateTimeConfigurationChangeNotification(
        static_cast<v8::Isolate::TimeZoneDetection>(time_zone_detection));
}

MaybeLocal<v8::RegExp> v8::RegExp::New(Local<Context> context,
    Local<String> pattern, Flags flags)
{
    PREPARE_FOR_EXECUTION(context, RegExp, New, RegExp);
    Local<v8::RegExp> result;
    has_pending_exception = !ToLocal<RegExp>(i::JSRegExp::New(isolate, Utils::OpenHandle(*pattern),
                                                 static_cast<i::JSRegExp::Flags>(flags)),
        &result);
    RETURN_ON_FAILED_EXECUTION(RegExp);
    RETURN_ESCAPED(result);
}

Local<v8::String> v8::RegExp::GetSource() const
{
    i::Handle<i::JSRegExp> obj = Utils::OpenHandle(this);
    return Utils::ToLocal(
        i::Handle<i::String>(obj->Pattern(), obj->GetIsolate()));
}

// Assert that the static flags cast in GetFlags is valid.
#define REGEXP_FLAG_ASSERT_EQ(flag) \
    STATIC_ASSERT(static_cast<int>(v8::RegExp::flag) == static_cast<int>(i::JSRegExp::flag))
REGEXP_FLAG_ASSERT_EQ(kNone);
REGEXP_FLAG_ASSERT_EQ(kGlobal);
REGEXP_FLAG_ASSERT_EQ(kIgnoreCase);
REGEXP_FLAG_ASSERT_EQ(kMultiline);
REGEXP_FLAG_ASSERT_EQ(kSticky);
REGEXP_FLAG_ASSERT_EQ(kUnicode);
#undef REGEXP_FLAG_ASSERT_EQ

v8::RegExp::Flags v8::RegExp::GetFlags() const
{
    i::Handle<i::JSRegExp> obj = Utils::OpenHandle(this);
    return RegExp::Flags(static_cast<int>(obj->GetFlags()));
}

Local<v8::Array> v8::Array::New(Isolate* isolate, int length)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, Array, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    int real_length = length > 0 ? length : 0;
    i::Handle<i::JSArray> obj = i_isolate->factory()->NewJSArray(real_length);
    i::Handle<i::Object> length_obj = i_isolate->factory()->NewNumberFromInt(real_length);
    obj->set_length(*length_obj);
    return Utils::ToLocal(obj);
}

Local<v8::Array> v8::Array::New(Isolate* isolate, Local<Value>* elements,
    size_t length)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::Factory* factory = i_isolate->factory();
    LOG_API(i_isolate, Array, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    int len = static_cast<int>(length);

    i::Handle<i::FixedArray> result = factory->NewFixedArray(len);
    for (int i = 0; i < len; i++) {
        i::Handle<i::Object> element = Utils::OpenHandle(*elements[i]);
        result->set(i, *element);
    }

    return Utils::ToLocal(
        factory->NewJSArrayWithElements(result, i::PACKED_ELEMENTS, len));
}

uint32_t v8::Array::Length() const
{
    i::Handle<i::JSArray> obj = Utils::OpenHandle(this);
    i::Object length = obj->length();
    if (length->IsSmi()) {
        return i::Smi::ToInt(length);
    } else {
        return static_cast<uint32_t>(length->Number());
    }
}

Local<v8::Map> v8::Map::New(Isolate* isolate)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, Map, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::JSMap> obj = i_isolate->factory()->NewJSMap();
    return Utils::ToLocal(obj);
}

size_t v8::Map::Size() const
{
    i::Handle<i::JSMap> obj = Utils::OpenHandle(this);
    return i::OrderedHashMap::cast(obj->table())->NumberOfElements();
}

void Map::Clear()
{
    auto self = Utils::OpenHandle(this);
    i::Isolate* isolate = self->GetIsolate();
    LOG_API(isolate, Map, Clear);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::JSMap::Clear(isolate, self);
}

MaybeLocal<Value> Map::Get(Local<Context> context, Local<Value> key)
{
    PREPARE_FOR_EXECUTION(context, Map, Get, Value);
    auto self = Utils::OpenHandle(this);
    Local<Value> result;
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*key) };
    has_pending_exception = !ToLocal<Value>(i::Execution::Call(isolate, isolate->map_get(), self,
                                                arraysize(argv), argv),
        &result);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(result);
}

MaybeLocal<Map> Map::Set(Local<Context> context, Local<Value> key,
    Local<Value> value)
{
    PREPARE_FOR_EXECUTION(context, Map, Set, Map);
    auto self = Utils::OpenHandle(this);
    i::Handle<i::Object> result;
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*key),
        Utils::OpenHandle(*value) };
    has_pending_exception = !i::Execution::Call(isolate, isolate->map_set(), self,
        arraysize(argv), argv)
                                 .ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION(Map);
    RETURN_ESCAPED(Local<Map>::Cast(Utils::ToLocal(result)));
}

Maybe<bool> Map::Has(Local<Context> context, Local<Value> key)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Map, Has, Nothing<bool>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    i::Handle<i::Object> result;
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*key) };
    has_pending_exception = !i::Execution::Call(isolate, isolate->map_has(), self,
        arraysize(argv), argv)
                                 .ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(result->IsTrue(isolate));
}

Maybe<bool> Map::Delete(Local<Context> context, Local<Value> key)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Map, Delete, Nothing<bool>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    i::Handle<i::Object> result;
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*key) };
    has_pending_exception = !i::Execution::Call(isolate, isolate->map_delete(),
        self, arraysize(argv), argv)
                                 .ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(result->IsTrue(isolate));
}

namespace {

    enum class MapAsArrayKind {
        kEntries = i::JS_MAP_KEY_VALUE_ITERATOR_TYPE,
        kKeys = i::JS_MAP_KEY_ITERATOR_TYPE,
        kValues = i::JS_MAP_VALUE_ITERATOR_TYPE
    };

    enum class SetAsArrayKind {
        kEntries = i::JS_SET_KEY_VALUE_ITERATOR_TYPE,
        kValues = i::JS_SET_VALUE_ITERATOR_TYPE
    };

    i::Handle<i::JSArray> MapAsArray(i::Isolate* isolate, i::Object table_obj,
        int offset, MapAsArrayKind kind)
    {
        i::Factory* factory = isolate->factory();
        i::Handle<i::OrderedHashMap> table(i::OrderedHashMap::cast(table_obj),
            isolate);
        const bool collect_keys = kind == MapAsArrayKind::kEntries || kind == MapAsArrayKind::kKeys;
        const bool collect_values = kind == MapAsArrayKind::kEntries || kind == MapAsArrayKind::kValues;
        int capacity = table->UsedCapacity();
        int max_length = (capacity - offset) * ((collect_keys && collect_values) ? 2 : 1);
        i::Handle<i::FixedArray> result = factory->NewFixedArray(max_length);
        int result_index = 0;
        {
            i::DisallowHeapAllocation no_gc;
            i::Oddball the_hole = i::ReadOnlyRoots(isolate).the_hole_value();
            for (int i = offset; i < capacity; ++i) {
                i::Object key = table->KeyAt(i);
                if (key == the_hole)
                    continue;
                if (collect_keys)
                    result->set(result_index++, key);
                if (collect_values)
                    result->set(result_index++, table->ValueAt(i));
            }
        }
        DCHECK_GE(max_length, result_index);
        if (result_index == 0)
            return factory->NewJSArray(0);
        result->Shrink(isolate, result_index);
        return factory->NewJSArrayWithElements(result, i::PACKED_ELEMENTS,
            result_index);
    }

} // namespace

Local<Array> Map::AsArray() const
{
    i::Handle<i::JSMap> obj = Utils::OpenHandle(this);
    i::Isolate* isolate = obj->GetIsolate();
    LOG_API(isolate, Map, AsArray);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    return Utils::ToLocal(
        MapAsArray(isolate, obj->table(), 0, MapAsArrayKind::kEntries));
}

Local<v8::Set> v8::Set::New(Isolate* isolate)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, Set, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::JSSet> obj = i_isolate->factory()->NewJSSet();
    return Utils::ToLocal(obj);
}

size_t v8::Set::Size() const
{
    i::Handle<i::JSSet> obj = Utils::OpenHandle(this);
    return i::OrderedHashSet::cast(obj->table())->NumberOfElements();
}

void Set::Clear()
{
    auto self = Utils::OpenHandle(this);
    i::Isolate* isolate = self->GetIsolate();
    LOG_API(isolate, Set, Clear);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::JSSet::Clear(isolate, self);
}

MaybeLocal<Set> Set::Add(Local<Context> context, Local<Value> key)
{
    PREPARE_FOR_EXECUTION(context, Set, Add, Set);
    auto self = Utils::OpenHandle(this);
    i::Handle<i::Object> result;
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*key) };
    has_pending_exception = !i::Execution::Call(isolate, isolate->set_add(), self,
        arraysize(argv), argv)
                                 .ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION(Set);
    RETURN_ESCAPED(Local<Set>::Cast(Utils::ToLocal(result)));
}

Maybe<bool> Set::Has(Local<Context> context, Local<Value> key)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Set, Has, Nothing<bool>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    i::Handle<i::Object> result;
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*key) };
    has_pending_exception = !i::Execution::Call(isolate, isolate->set_has(), self,
        arraysize(argv), argv)
                                 .ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(result->IsTrue(isolate));
}

Maybe<bool> Set::Delete(Local<Context> context, Local<Value> key)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Set, Delete, Nothing<bool>(), i::HandleScope);
    auto self = Utils::OpenHandle(this);
    i::Handle<i::Object> result;
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*key) };
    has_pending_exception = !i::Execution::Call(isolate, isolate->set_delete(),
        self, arraysize(argv), argv)
                                 .ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(result->IsTrue(isolate));
}

namespace {
    i::Handle<i::JSArray> SetAsArray(i::Isolate* isolate, i::Object table_obj,
        int offset, SetAsArrayKind kind)
    {
        i::Factory* factory = isolate->factory();
        i::Handle<i::OrderedHashSet> table(i::OrderedHashSet::cast(table_obj),
            isolate);
        // Elements skipped by |offset| may already be deleted.
        int capacity = table->UsedCapacity();
        const bool collect_key_values = kind == SetAsArrayKind::kEntries;
        int max_length = (capacity - offset) * (collect_key_values ? 2 : 1);
        if (max_length == 0)
            return factory->NewJSArray(0);
        i::Handle<i::FixedArray> result = factory->NewFixedArray(max_length);
        int result_index = 0;
        {
            i::DisallowHeapAllocation no_gc;
            i::Oddball the_hole = i::ReadOnlyRoots(isolate).the_hole_value();
            for (int i = offset; i < capacity; ++i) {
                i::Object key = table->KeyAt(i);
                if (key == the_hole)
                    continue;
                result->set(result_index++, key);
                if (collect_key_values)
                    result->set(result_index++, key);
            }
        }
        DCHECK_GE(max_length, result_index);
        if (result_index == 0)
            return factory->NewJSArray(0);
        result->Shrink(isolate, result_index);
        return factory->NewJSArrayWithElements(result, i::PACKED_ELEMENTS,
            result_index);
    }
} // namespace

Local<Array> Set::AsArray() const
{
    i::Handle<i::JSSet> obj = Utils::OpenHandle(this);
    i::Isolate* isolate = obj->GetIsolate();
    LOG_API(isolate, Set, AsArray);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    return Utils::ToLocal(
        SetAsArray(isolate, obj->table(), 0, SetAsArrayKind::kValues));
}

MaybeLocal<Promise::Resolver> Promise::Resolver::New(Local<Context> context)
{
    PREPARE_FOR_EXECUTION(context, Promise_Resolver, New, Resolver);
    Local<Promise::Resolver> result;
    has_pending_exception = !ToLocal<Promise::Resolver>(isolate->factory()->NewJSPromise(), &result);
    RETURN_ON_FAILED_EXECUTION(Promise::Resolver);
    RETURN_ESCAPED(result);
}

Local<Promise> Promise::Resolver::GetPromise()
{
    i::Handle<i::JSReceiver> promise = Utils::OpenHandle(this);
    return Local<Promise>::Cast(Utils::ToLocal(promise));
}

Maybe<bool> Promise::Resolver::Resolve(Local<Context> context,
    Local<Value> value)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Promise_Resolver, Resolve, Nothing<bool>(),
        i::HandleScope);
    auto self = Utils::OpenHandle(this);
    auto promise = i::Handle<i::JSPromise>::cast(self);

    if (promise->status() != Promise::kPending) {
        return Just(true);
    }

    has_pending_exception = i::JSPromise::Resolve(promise, Utils::OpenHandle(*value)).is_null();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(true);
}

Maybe<bool> Promise::Resolver::Reject(Local<Context> context,
    Local<Value> value)
{
    auto isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8(isolate, context, Promise_Resolver, Reject, Nothing<bool>(),
        i::HandleScope);
    auto self = Utils::OpenHandle(this);
    auto promise = i::Handle<i::JSPromise>::cast(self);

    if (promise->status() != Promise::kPending) {
        return Just(true);
    }

    has_pending_exception = i::JSPromise::Reject(promise, Utils::OpenHandle(*value)).is_null();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(true);
}

MaybeLocal<Promise> Promise::Catch(Local<Context> context,
    Local<Function> handler)
{
    PREPARE_FOR_EXECUTION(context, Promise, Catch, Promise);
    auto self = Utils::OpenHandle(this);
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*handler) };
    i::Handle<i::Object> result;
    has_pending_exception = !i::Execution::Call(isolate, isolate->promise_catch(),
        self, arraysize(argv), argv)
                                 .ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION(Promise);
    RETURN_ESCAPED(Local<Promise>::Cast(Utils::ToLocal(result)));
}

MaybeLocal<Promise> Promise::Then(Local<Context> context,
    Local<Function> handler)
{
    PREPARE_FOR_EXECUTION(context, Promise, Then, Promise);
    auto self = Utils::OpenHandle(this);
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*handler) };
    i::Handle<i::Object> result;
    has_pending_exception = !i::Execution::Call(isolate, isolate->promise_then(),
        self, arraysize(argv), argv)
                                 .ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION(Promise);
    RETURN_ESCAPED(Local<Promise>::Cast(Utils::ToLocal(result)));
}

MaybeLocal<Promise> Promise::Then(Local<Context> context,
    Local<Function> on_fulfilled,
    Local<Function> on_rejected)
{
    PREPARE_FOR_EXECUTION(context, Promise, Then, Promise);
    auto self = Utils::OpenHandle(this);
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*on_fulfilled),
        Utils::OpenHandle(*on_rejected) };
    i::Handle<i::Object> result;
    has_pending_exception = !i::Execution::Call(isolate, isolate->promise_then(),
        self, arraysize(argv), argv)
                                 .ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION(Promise);
    RETURN_ESCAPED(Local<Promise>::Cast(Utils::ToLocal(result)));
}

bool Promise::HasHandler()
{
    i::Handle<i::JSReceiver> promise = Utils::OpenHandle(this);
    i::Isolate* isolate = promise->GetIsolate();
    LOG_API(isolate, Promise, HasRejectHandler);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    if (promise->IsJSPromise()) {
        i::Handle<i::JSPromise> js_promise = i::Handle<i::JSPromise>::cast(promise);
        return js_promise->has_handler();
    }
    return false;
}

Local<Value> Promise::Result()
{
    i::Handle<i::JSReceiver> promise = Utils::OpenHandle(this);
    i::Isolate* isolate = promise->GetIsolate();
    LOG_API(isolate, Promise, Result);
    i::Handle<i::JSPromise> js_promise = i::Handle<i::JSPromise>::cast(promise);
    Utils::ApiCheck(js_promise->status() != kPending, "v8_Promise_Result",
        "Promise is still pending");
    i::Handle<i::Object> result(js_promise->result(), isolate);
    return Utils::ToLocal(result);
}

Promise::PromiseState Promise::State()
{
    i::Handle<i::JSReceiver> promise = Utils::OpenHandle(this);
    i::Isolate* isolate = promise->GetIsolate();
    LOG_API(isolate, Promise, Status);
    i::Handle<i::JSPromise> js_promise = i::Handle<i::JSPromise>::cast(promise);
    return static_cast<PromiseState>(js_promise->status());
}

void Promise::MarkAsHandled()
{
    i::Handle<i::JSPromise> js_promise = Utils::OpenHandle(this);
    js_promise->set_has_handler(true);
}

Local<Value> Proxy::GetTarget()
{
    i::Handle<i::JSProxy> self = Utils::OpenHandle(this);
    i::Handle<i::Object> target(self->target(), self->GetIsolate());
    return Utils::ToLocal(target);
}

Local<Value> Proxy::GetHandler()
{
    i::Handle<i::JSProxy> self = Utils::OpenHandle(this);
    i::Handle<i::Object> handler(self->handler(), self->GetIsolate());
    return Utils::ToLocal(handler);
}

bool Proxy::IsRevoked()
{
    i::Handle<i::JSProxy> self = Utils::OpenHandle(this);
    return self->IsRevoked();
}

void Proxy::Revoke()
{
    i::Handle<i::JSProxy> self = Utils::OpenHandle(this);
    i::JSProxy::Revoke(self);
}

MaybeLocal<Proxy> Proxy::New(Local<Context> context, Local<Object> local_target,
    Local<Object> local_handler)
{
    PREPARE_FOR_EXECUTION(context, Proxy, New, Proxy);
    i::Handle<i::JSReceiver> target = Utils::OpenHandle(*local_target);
    i::Handle<i::JSReceiver> handler = Utils::OpenHandle(*local_handler);
    Local<Proxy> result;
    has_pending_exception = !ToLocal<Proxy>(i::JSProxy::New(isolate, target, handler), &result);
    RETURN_ON_FAILED_EXECUTION(Proxy);
    RETURN_ESCAPED(result);
}

CompiledWasmModule::CompiledWasmModule(
    std::shared_ptr<internal::wasm::NativeModule> native_module)
    : native_module_(std::move(native_module))
{
    CHECK_NOT_NULL(native_module_);
}

OwnedBuffer CompiledWasmModule::Serialize()
{
    i::wasm::WasmSerializer wasm_serializer(native_module_.get());
    size_t buffer_size = wasm_serializer.GetSerializedNativeModuleSize();
    std::unique_ptr<uint8_t[]> buffer(new uint8_t[buffer_size]);
    if (!wasm_serializer.SerializeNativeModule({ buffer.get(), buffer_size }))
        return {};
    return { std::move(buffer), buffer_size };
}

MemorySpan<const uint8_t> CompiledWasmModule::GetWireBytesRef()
{
    i::Vector<const uint8_t> bytes_vec = native_module_->wire_bytes();
    return { bytes_vec.start(), bytes_vec.size() };
}

WasmModuleObject::TransferrableModule
WasmModuleObject::GetTransferrableModule()
{
    if (i::FLAG_wasm_shared_code) {
        i::Handle<i::WasmModuleObject> obj = i::Handle<i::WasmModuleObject>::cast(Utils::OpenHandle(this));
        return TransferrableModule(obj->shared_native_module());
    } else {
        CompiledWasmModule compiled_module = GetCompiledModule();
        OwnedBuffer serialized_module = compiled_module.Serialize();
        MemorySpan<const uint8_t> wire_bytes_ref = compiled_module.GetWireBytesRef();
        size_t wire_size = wire_bytes_ref.size();
        std::unique_ptr<uint8_t[]> wire_bytes_copy(new uint8_t[wire_size]);
        memcpy(wire_bytes_copy.get(), wire_bytes_ref.data(), wire_size);
        return TransferrableModule(std::move(serialized_module),
            { std::move(wire_bytes_copy), wire_size });
    }
}

CompiledWasmModule WasmModuleObject::GetCompiledModule()
{
    i::Handle<i::WasmModuleObject> obj = i::Handle<i::WasmModuleObject>::cast(Utils::OpenHandle(this));
    return Utils::Convert(obj->shared_native_module());
}

MaybeLocal<WasmModuleObject> WasmModuleObject::FromTransferrableModule(
    Isolate* isolate,
    const WasmModuleObject::TransferrableModule& transferrable_module)
{
    if (i::FLAG_wasm_shared_code) {
        i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
        i::Handle<i::WasmModuleObject> module_object = i_isolate->wasm_engine()->ImportNativeModule(
            i_isolate, transferrable_module.shared_module_);
        return Local<WasmModuleObject>::Cast(
            Utils::ToLocal(i::Handle<i::JSObject>::cast(module_object)));
    } else {
        return Deserialize(isolate, AsReference(transferrable_module.serialized_),
            AsReference(transferrable_module.wire_bytes_));
    }
}

MaybeLocal<WasmModuleObject> WasmModuleObject::Deserialize(
    Isolate* isolate, MemorySpan<const uint8_t> serialized_module,
    MemorySpan<const uint8_t> wire_bytes)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::MaybeHandle<i::WasmModuleObject> maybe_module_object = i::wasm::DeserializeNativeModule(
        i_isolate, { serialized_module.data(), serialized_module.size() },
        { wire_bytes.data(), wire_bytes.size() });
    i::Handle<i::WasmModuleObject> module_object;
    if (!maybe_module_object.ToHandle(&module_object)) {
        return MaybeLocal<WasmModuleObject>();
    }
    return Local<WasmModuleObject>::Cast(
        Utils::ToLocal(i::Handle<i::JSObject>::cast(module_object)));
}

MaybeLocal<WasmModuleObject> WasmModuleObject::DeserializeOrCompile(
    Isolate* isolate, MemorySpan<const uint8_t> serialized_module,
    MemorySpan<const uint8_t> wire_bytes)
{
    MaybeLocal<WasmModuleObject> ret = Deserialize(isolate, serialized_module, wire_bytes);
    if (!ret.IsEmpty()) {
        return ret;
    }
    return Compile(isolate, wire_bytes.data(), wire_bytes.size());
}

MaybeLocal<WasmModuleObject> WasmModuleObject::Compile(Isolate* isolate,
    const uint8_t* start,
    size_t length)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    if (!i::wasm::IsWasmCodegenAllowed(i_isolate, i_isolate->native_context())) {
        return MaybeLocal<WasmModuleObject>();
    }
    i::MaybeHandle<i::JSObject> maybe_compiled;
    {
        i::wasm::ErrorThrower thrower(i_isolate, "WasmModuleObject::Compile()");
        auto enabled_features = i::wasm::WasmFeaturesFromIsolate(i_isolate);
        maybe_compiled = i_isolate->wasm_engine()->SyncCompile(
            i_isolate, enabled_features, &thrower,
            i::wasm::ModuleWireBytes(start, start + length));
    }
    CHECK_EQ(maybe_compiled.is_null(), i_isolate->has_pending_exception());
    if (maybe_compiled.is_null()) {
        i_isolate->OptionalRescheduleException(false);
        return MaybeLocal<WasmModuleObject>();
    }
    return Local<WasmModuleObject>::Cast(
        Utils::ToLocal(maybe_compiled.ToHandleChecked()));
}

// Resolves the result of streaming compilation.
// TODO(ahaas): Refactor the streaming compilation API so that this class can
// move to wasm-js.cc.
class AsyncCompilationResolver : public i::wasm::CompilationResultResolver {
public:
    AsyncCompilationResolver(Isolate* isolate, Local<Promise> promise)
        : promise_(
            reinterpret_cast<i::Isolate*>(isolate)->global_handles()->Create(
                *Utils::OpenHandle(*promise)))
    {
    }

    ~AsyncCompilationResolver() override
    {
        i::GlobalHandles::Destroy(promise_.location());
    }

    void OnCompilationSucceeded(i::Handle<i::WasmModuleObject> result) override
    {
        i::MaybeHandle<i::Object> promise_result = i::JSPromise::Resolve(promise_, result);
        CHECK_EQ(promise_result.is_null(),
            promise_->GetIsolate()->has_pending_exception());
    }

    void OnCompilationFailed(i::Handle<i::Object> error_reason) override
    {
        i::MaybeHandle<i::Object> promise_result = i::JSPromise::Reject(promise_, error_reason);
        CHECK_EQ(promise_result.is_null(),
            promise_->GetIsolate()->has_pending_exception());
    }

private:
    i::Handle<i::JSPromise> promise_;
};

WasmModuleObjectBuilderStreaming::WasmModuleObjectBuilderStreaming(
    Isolate* isolate)
{
    USE(isolate_);
}

Local<Promise> WasmModuleObjectBuilderStreaming::GetPromise() { return {}; }

void WasmModuleObjectBuilderStreaming::OnBytesReceived(const uint8_t* bytes,
    size_t size)
{
}

void WasmModuleObjectBuilderStreaming::Finish()
{
}

void WasmModuleObjectBuilderStreaming::Abort(MaybeLocal<Value> exception)
{
}

// static
v8::ArrayBuffer::Allocator* v8::ArrayBuffer::Allocator::NewDefaultAllocator()
{
    return new ArrayBufferAllocator();
}

bool v8::ArrayBuffer::IsExternal() const
{
    return Utils::OpenHandle(this)->is_external();
}

bool v8::ArrayBuffer::IsDetachable() const
{
    return Utils::OpenHandle(this)->is_detachable();
}

v8::ArrayBuffer::Contents v8::ArrayBuffer::Externalize()
{
    i::Handle<i::JSArrayBuffer> self = Utils::OpenHandle(this);
    i::Isolate* isolate = self->GetIsolate();
    Utils::ApiCheck(!self->is_external(), "v8_ArrayBuffer_Externalize",
        "ArrayBuffer already externalized");
    self->set_is_external(true);

    const v8::ArrayBuffer::Contents contents = GetContents();
    isolate->heap()->UnregisterArrayBuffer(*self);

    // A regular copy is good enough. No move semantics needed.
    return contents;
}

v8::ArrayBuffer::Contents::Contents(void* data, size_t byte_length,
    void* allocation_base,
    size_t allocation_length,
    Allocator::AllocationMode allocation_mode,
    DeleterCallback deleter, void* deleter_data)
    : data_(data)
    , byte_length_(byte_length)
    , allocation_base_(allocation_base)
    , allocation_length_(allocation_length)
    , allocation_mode_(allocation_mode)
    , deleter_(deleter)
    , deleter_data_(deleter_data)
{
    DCHECK_LE(allocation_base_, data_);
    DCHECK_LE(byte_length_, allocation_length_);
}

void WasmMemoryDeleter(void* buffer, size_t lenght, void* info)
{
    internal::wasm::WasmEngine* engine = reinterpret_cast<internal::wasm::WasmEngine*>(info);
    CHECK(engine->memory_tracker()->FreeMemoryIfIsWasmMemory(nullptr, buffer));
}

void ArrayBufferDeleter(void* buffer, size_t length, void* info)
{
    v8::ArrayBuffer::Allocator* allocator = reinterpret_cast<v8::ArrayBuffer::Allocator*>(info);
    allocator->Free(buffer, length);
}

v8::ArrayBuffer::Contents v8::ArrayBuffer::GetContents()
{
    i::Handle<i::JSArrayBuffer> self = Utils::OpenHandle(this);
    Contents contents(
        self->backing_store(), self->byte_length(), self->allocation_base(),
        self->allocation_length(),
        self->is_wasm_memory() ? Allocator::AllocationMode::kReservation
                               : Allocator::AllocationMode::kNormal,
        self->is_wasm_memory() ? WasmMemoryDeleter : ArrayBufferDeleter,
        self->is_wasm_memory()
            ? static_cast<void*>(self->GetIsolate()->wasm_engine())
            : static_cast<void*>(self->GetIsolate()->array_buffer_allocator()));
    return contents;
}

void v8::ArrayBuffer::Detach()
{
    i::Handle<i::JSArrayBuffer> obj = Utils::OpenHandle(this);
    i::Isolate* isolate = obj->GetIsolate();
    Utils::ApiCheck(obj->is_external(), "v8::ArrayBuffer::Detach",
        "Only externalized ArrayBuffers can be detached");
    Utils::ApiCheck(obj->is_detachable(), "v8::ArrayBuffer::Detach",
        "Only detachable ArrayBuffers can be detached");
    LOG_API(isolate, ArrayBuffer, Detach);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    obj->Detach();
}

size_t v8::ArrayBuffer::ByteLength() const
{
    i::Handle<i::JSArrayBuffer> obj = Utils::OpenHandle(this);
    return obj->byte_length();
}

Local<ArrayBuffer> v8::ArrayBuffer::New(Isolate* isolate, size_t byte_length)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, ArrayBuffer, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::JSArrayBuffer> obj = i_isolate->factory()->NewJSArrayBuffer(i::SharedFlag::kNotShared);
    // TODO(jbroman): It may be useful in the future to provide a MaybeLocal
    // version that throws an exception or otherwise does not crash.
    if (!i::JSArrayBuffer::SetupAllocatingData(obj, i_isolate, byte_length)) {
        i::FatalProcessOutOfMemory(i_isolate, "v8::ArrayBuffer::New");
    }
    return Utils::ToLocal(obj);
}

Local<ArrayBuffer> v8::ArrayBuffer::New(Isolate* isolate, void* data,
    size_t byte_length,
    ArrayBufferCreationMode mode)
{
    // Embedders must guarantee that the external backing store is valid.
    CHECK(byte_length == 0 || data != nullptr);
    CHECK_LE(byte_length, i::JSArrayBuffer::kMaxByteLength);
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, ArrayBuffer, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::JSArrayBuffer> obj = i_isolate->factory()->NewJSArrayBuffer(i::SharedFlag::kNotShared);
    i::JSArrayBuffer::Setup(obj, i_isolate,
        mode == ArrayBufferCreationMode::kExternalized, data,
        byte_length);
    return Utils::ToLocal(obj);
}

Local<ArrayBuffer> v8::ArrayBufferView::Buffer()
{
    i::Handle<i::JSArrayBufferView> obj = Utils::OpenHandle(this);
    i::Handle<i::JSArrayBuffer> buffer;
    if (obj->IsJSDataView()) {
        i::Handle<i::JSDataView> data_view(i::JSDataView::cast(*obj),
            obj->GetIsolate());
        DCHECK(data_view->buffer()->IsJSArrayBuffer());
        buffer = i::handle(i::JSArrayBuffer::cast(data_view->buffer()),
            data_view->GetIsolate());
    } else {
        DCHECK(obj->IsJSTypedArray());
        buffer = i::JSTypedArray::cast(*obj)->GetBuffer();
    }
    return Utils::ToLocal(buffer);
}

size_t v8::ArrayBufferView::CopyContents(void* dest, size_t byte_length)
{
    i::Handle<i::JSArrayBufferView> self = Utils::OpenHandle(this);
    size_t byte_offset = self->byte_offset();
    size_t bytes_to_copy = i::Min(byte_length, self->byte_length());
    if (bytes_to_copy) {
        i::DisallowHeapAllocation no_gc;
        i::Isolate* isolate = self->GetIsolate();
        i::Handle<i::JSArrayBuffer> buffer(i::JSArrayBuffer::cast(self->buffer()),
            isolate);
        const char* source = reinterpret_cast<char*>(buffer->backing_store());
        if (source == nullptr) {
            DCHECK(self->IsJSTypedArray());
            i::Handle<i::JSTypedArray> typed_array(i::JSTypedArray::cast(*self),
                isolate);
            i::Handle<i::FixedTypedArrayBase> fixed_array(
                i::FixedTypedArrayBase::cast(typed_array->elements()), isolate);
            source = reinterpret_cast<char*>(fixed_array->DataPtr());
        }
        memcpy(dest, source + byte_offset, bytes_to_copy);
    }
    return bytes_to_copy;
}

bool v8::ArrayBufferView::HasBuffer() const
{
    i::Handle<i::JSArrayBufferView> self = Utils::OpenHandle(this);
    i::Handle<i::JSArrayBuffer> buffer(i::JSArrayBuffer::cast(self->buffer()),
        self->GetIsolate());
    return buffer->backing_store() != nullptr;
}

size_t v8::ArrayBufferView::ByteOffset()
{
    i::Handle<i::JSArrayBufferView> obj = Utils::OpenHandle(this);
    return obj->WasDetached() ? 0 : obj->byte_offset();
}

size_t v8::ArrayBufferView::ByteLength()
{
    i::Handle<i::JSArrayBufferView> obj = Utils::OpenHandle(this);
    return obj->WasDetached() ? 0 : obj->byte_length();
}

size_t v8::TypedArray::Length()
{
    i::Handle<i::JSTypedArray> obj = Utils::OpenHandle(this);
    return obj->WasDetached() ? 0 : obj->length_value();
}

static_assert(v8::TypedArray::kMaxLength == i::Smi::kMaxValue,
    "v8::TypedArray::kMaxLength must match i::Smi::kMaxValue");

#define TYPED_ARRAY_NEW(Type, type, TYPE, ctype)                                      \
    Local<Type##Array> Type##Array::New(Local<ArrayBuffer> array_buffer,              \
        size_t byte_offset, size_t length)                                            \
    {                                                                                 \
        i::Isolate* isolate = Utils::OpenHandle(*array_buffer)->GetIsolate();         \
        LOG_API(isolate, Type##Array, New);                                           \
        ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);                                     \
        if (!Utils::ApiCheck(length <= kMaxLength,                                    \
                "v8::" #Type                                                          \
                "Array::New(Local<ArrayBuffer>, size_t, size_t)",                     \
                "length exceeds max allowed value")) {                                \
            return Local<Type##Array>();                                              \
        }                                                                             \
        i::Handle<i::JSArrayBuffer> buffer = Utils::OpenHandle(*array_buffer);        \
        i::Handle<i::JSTypedArray> obj = isolate->factory()->NewJSTypedArray(         \
            i::kExternal##Type##Array, buffer, byte_offset, length);                  \
        return Utils::ToLocal##Type##Array(obj);                                      \
    }                                                                                 \
    Local<Type##Array> Type##Array::New(                                              \
        Local<SharedArrayBuffer> shared_array_buffer, size_t byte_offset,             \
        size_t length)                                                                \
    {                                                                                 \
        CHECK(i::FLAG_harmony_sharedarraybuffer);                                     \
        i::Isolate* isolate = Utils::OpenHandle(*shared_array_buffer)->GetIsolate();  \
        LOG_API(isolate, Type##Array, New);                                           \
        ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);                                     \
        if (!Utils::ApiCheck(                                                         \
                length <= kMaxLength,                                                 \
                "v8::" #Type                                                          \
                "Array::New(Local<SharedArrayBuffer>, size_t, size_t)",               \
                "length exceeds max allowed value")) {                                \
            return Local<Type##Array>();                                              \
        }                                                                             \
        i::Handle<i::JSArrayBuffer> buffer = Utils::OpenHandle(*shared_array_buffer); \
        i::Handle<i::JSTypedArray> obj = isolate->factory()->NewJSTypedArray(         \
            i::kExternal##Type##Array, buffer, byte_offset, length);                  \
        return Utils::ToLocal##Type##Array(obj);                                      \
    }

TYPED_ARRAYS(TYPED_ARRAY_NEW)
#undef TYPED_ARRAY_NEW

Local<DataView> DataView::New(Local<ArrayBuffer> array_buffer,
    size_t byte_offset, size_t byte_length)
{
    i::Handle<i::JSArrayBuffer> buffer = Utils::OpenHandle(*array_buffer);
    i::Isolate* isolate = buffer->GetIsolate();
    LOG_API(isolate, DataView, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::Handle<i::JSDataView> obj = isolate->factory()->NewJSDataView(buffer, byte_offset, byte_length);
    return Utils::ToLocal(obj);
}

Local<DataView> DataView::New(Local<SharedArrayBuffer> shared_array_buffer,
    size_t byte_offset, size_t byte_length)
{
    CHECK(i::FLAG_harmony_sharedarraybuffer);
    i::Handle<i::JSArrayBuffer> buffer = Utils::OpenHandle(*shared_array_buffer);
    i::Isolate* isolate = buffer->GetIsolate();
    LOG_API(isolate, DataView, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::Handle<i::JSDataView> obj = isolate->factory()->NewJSDataView(buffer, byte_offset, byte_length);
    return Utils::ToLocal(obj);
}

namespace {
    i::Handle<i::JSArrayBuffer> SetupSharedArrayBuffer(
        Isolate* isolate, void* data, size_t byte_length,
        ArrayBufferCreationMode mode)
    {
        CHECK(i::FLAG_harmony_sharedarraybuffer);
        // Embedders must guarantee that the external backing store is valid.
        CHECK(byte_length == 0 || data != nullptr);
        i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
        LOG_API(i_isolate, SharedArrayBuffer, New);
        ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
        i::Handle<i::JSArrayBuffer> obj = i_isolate->factory()->NewJSArrayBuffer(i::SharedFlag::kShared);
        bool is_wasm_memory = i_isolate->wasm_engine()->memory_tracker()->IsWasmMemory(data);
        i::JSArrayBuffer::Setup(obj, i_isolate,
            mode == ArrayBufferCreationMode::kExternalized, data,
            byte_length, i::SharedFlag::kShared, is_wasm_memory);
        return obj;
    }

} // namespace

bool v8::SharedArrayBuffer::IsExternal() const
{
    return Utils::OpenHandle(this)->is_external();
}

v8::SharedArrayBuffer::Contents v8::SharedArrayBuffer::Externalize()
{
    i::Handle<i::JSArrayBuffer> self = Utils::OpenHandle(this);
    i::Isolate* isolate = self->GetIsolate();
    Utils::ApiCheck(!self->is_external(), "v8_SharedArrayBuffer_Externalize",
        "SharedArrayBuffer already externalized");
    self->set_is_external(true);

    const v8::SharedArrayBuffer::Contents contents = GetContents();
    isolate->heap()->UnregisterArrayBuffer(*self);

    // A regular copy is good enough. No move semantics needed.
    return contents;
}

v8::SharedArrayBuffer::Contents::Contents(
    void* data, size_t byte_length, void* allocation_base,
    size_t allocation_length, Allocator::AllocationMode allocation_mode,
    DeleterCallback deleter, void* deleter_data, bool is_growable)
    : data_(data)
    , byte_length_(byte_length)
    , allocation_base_(allocation_base)
    , allocation_length_(allocation_length)
    , allocation_mode_(allocation_mode)
    , deleter_(deleter)
    , deleter_data_(deleter_data)
{
    DCHECK_LE(allocation_base_, data_);
    DCHECK_LE(byte_length_, allocation_length_);
}

v8::SharedArrayBuffer::Contents v8::SharedArrayBuffer::GetContents()
{
    i::Handle<i::JSArrayBuffer> self = Utils::OpenHandle(this);
    Contents contents(
        self->backing_store(), self->byte_length(), self->allocation_base(),
        self->allocation_length(),
        self->is_wasm_memory()
            ? ArrayBuffer::Allocator::AllocationMode::kReservation
            : ArrayBuffer::Allocator::AllocationMode::kNormal,
        self->is_wasm_memory()
            ? reinterpret_cast<Contents::DeleterCallback>(WasmMemoryDeleter)
            : reinterpret_cast<Contents::DeleterCallback>(ArrayBufferDeleter),
        self->is_wasm_memory()
            ? static_cast<void*>(self->GetIsolate()->wasm_engine())
            : static_cast<void*>(self->GetIsolate()->array_buffer_allocator()),
        false);
    return contents;
}

size_t v8::SharedArrayBuffer::ByteLength() const
{
    i::Handle<i::JSArrayBuffer> obj = Utils::OpenHandle(this);
    return obj->byte_length();
}

Local<SharedArrayBuffer> v8::SharedArrayBuffer::New(Isolate* isolate,
    size_t byte_length)
{
    CHECK(i::FLAG_harmony_sharedarraybuffer);
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, SharedArrayBuffer, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::JSArrayBuffer> obj = i_isolate->factory()->NewJSArrayBuffer(i::SharedFlag::kShared);
    // TODO(jbroman): It may be useful in the future to provide a MaybeLocal
    // version that throws an exception or otherwise does not crash.
    if (!i::JSArrayBuffer::SetupAllocatingData(obj, i_isolate, byte_length, true,
            i::SharedFlag::kShared)) {
        i::FatalProcessOutOfMemory(i_isolate, "v8::SharedArrayBuffer::New");
    }
    return Utils::ToLocalShared(obj);
}

Local<SharedArrayBuffer> v8::SharedArrayBuffer::New(
    Isolate* isolate, void* data, size_t byte_length,
    ArrayBufferCreationMode mode)
{
    i::Handle<i::JSArrayBuffer> buffer = SetupSharedArrayBuffer(isolate, data, byte_length, mode);
    return Utils::ToLocalShared(buffer);
}

Local<SharedArrayBuffer> v8::SharedArrayBuffer::New(
    Isolate* isolate, const SharedArrayBuffer::Contents& contents,
    ArrayBufferCreationMode mode)
{
    i::Handle<i::JSArrayBuffer> buffer = SetupSharedArrayBuffer(
        isolate, contents.Data(), contents.ByteLength(), mode);
    return Utils::ToLocalShared(buffer);
}

Local<Symbol> v8::Symbol::New(Isolate* isolate, Local<String> name)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, Symbol, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::Symbol> result = i_isolate->factory()->NewSymbol();
    if (!name.IsEmpty())
        result->set_name(*Utils::OpenHandle(*name));
    return Utils::ToLocal(result);
}

Local<Symbol> v8::Symbol::For(Isolate* isolate, Local<String> name)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::Handle<i::String> i_name = Utils::OpenHandle(*name);
    return Utils::ToLocal(
        i_isolate->SymbolFor(i::RootIndex::kPublicSymbolTable, i_name, false));
}

Local<Symbol> v8::Symbol::ForApi(Isolate* isolate, Local<String> name)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::Handle<i::String> i_name = Utils::OpenHandle(*name);
    return Utils::ToLocal(
        i_isolate->SymbolFor(i::RootIndex::kApiSymbolTable, i_name, false));
}

#define WELL_KNOWN_SYMBOLS(V)                   \
    V(AsyncIterator, async_iterator)            \
    V(HasInstance, has_instance)                \
    V(IsConcatSpreadable, is_concat_spreadable) \
    V(Iterator, iterator)                       \
    V(Match, match)                             \
    V(Replace, replace)                         \
    V(Search, search)                           \
    V(Split, split)                             \
    V(ToPrimitive, to_primitive)                \
    V(ToStringTag, to_string_tag)               \
    V(Unscopables, unscopables)

#define SYMBOL_GETTER(Name, name)                                       \
    Local<Symbol> v8::Symbol::Get##Name(Isolate* isolate)               \
    {                                                                   \
        i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate); \
        return Utils::ToLocal(i_isolate->factory()->name##_symbol());   \
    }

WELL_KNOWN_SYMBOLS(SYMBOL_GETTER)

#undef SYMBOL_GETTER
#undef WELL_KNOWN_SYMBOLS

Local<Private> v8::Private::New(Isolate* isolate, Local<String> name)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, Private, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::Symbol> symbol = i_isolate->factory()->NewPrivateSymbol();
    if (!name.IsEmpty())
        symbol->set_name(*Utils::OpenHandle(*name));
    Local<Symbol> result = Utils::ToLocal(symbol);
    return v8::Local<Private>(reinterpret_cast<Private*>(*result));
}

Local<Private> v8::Private::ForApi(Isolate* isolate, Local<String> name)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::Handle<i::String> i_name = Utils::OpenHandle(*name);
    Local<Symbol> result = Utils::ToLocal(
        i_isolate->SymbolFor(i::RootIndex::kApiPrivateSymbolTable, i_name, true));
    return v8::Local<Private>(reinterpret_cast<Private*>(*result));
}

Local<Number> v8::Number::New(Isolate* isolate, double value)
{
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    if (/*std::*/isnan(value)) {
        // Introduce only canonical NaN value into the VM, to avoid signaling NaNs.
        value = std::numeric_limits<double>::quiet_NaN();
    }
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(internal_isolate);
    i::Handle<i::Object> result = internal_isolate->factory()->NewNumber(value);
    return Utils::NumberToLocal(result);
}

Local<Integer> v8::Integer::New(Isolate* isolate, int32_t value)
{
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    if (i::Smi::IsValid(value)) {
        return Utils::IntegerToLocal(i::Handle<i::Object>(i::Smi::FromInt(value),
            internal_isolate));
    }
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(internal_isolate);
    i::Handle<i::Object> result = internal_isolate->factory()->NewNumber(value);
    return Utils::IntegerToLocal(result);
}

Local<Integer> v8::Integer::NewFromUnsigned(Isolate* isolate, uint32_t value)
{
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    bool fits_into_int32_t = (value & (1 << 31)) == 0;
    if (fits_into_int32_t) {
        return Integer::New(isolate, static_cast<int32_t>(value));
    }
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(internal_isolate);
    i::Handle<i::Object> result = internal_isolate->factory()->NewNumber(value);
    return Utils::IntegerToLocal(result);
}

Local<BigInt> v8::BigInt::New(Isolate* isolate, int64_t value)
{
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(internal_isolate);
    i::Handle<i::BigInt> result = i::BigInt::FromInt64(internal_isolate, value);
    return Utils::ToLocal(result);
}

Local<BigInt> v8::BigInt::NewFromUnsigned(Isolate* isolate, uint64_t value)
{
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(internal_isolate);
    i::Handle<i::BigInt> result = i::BigInt::FromUint64(internal_isolate, value);
    return Utils::ToLocal(result);
}

MaybeLocal<BigInt> v8::BigInt::NewFromWords(Local<Context> context,
    int sign_bit, int word_count,
    const uint64_t* words)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(context->GetIsolate());
    ENTER_V8_NO_SCRIPT(isolate, context, BigInt, NewFromWords,
        MaybeLocal<BigInt>(), InternalEscapableScope);
    i::MaybeHandle<i::BigInt> result = i::BigInt::FromWords64(isolate, sign_bit, word_count, words);
    has_pending_exception = result.is_null();
    RETURN_ON_FAILED_EXECUTION(BigInt);
    RETURN_ESCAPED(Utils::ToLocal(result.ToHandleChecked()));
}

uint64_t v8::BigInt::Uint64Value(bool* lossless) const
{
    i::Handle<i::BigInt> handle = Utils::OpenHandle(this);
    return handle->AsUint64(lossless);
}

int64_t v8::BigInt::Int64Value(bool* lossless) const
{
    i::Handle<i::BigInt> handle = Utils::OpenHandle(this);
    return handle->AsInt64(lossless);
}

int BigInt::WordCount() const
{
    i::Handle<i::BigInt> handle = Utils::OpenHandle(this);
    return handle->Words64Count();
}

void BigInt::ToWordsArray(int* sign_bit, int* word_count,
    uint64_t* words) const
{
    i::Handle<i::BigInt> handle = Utils::OpenHandle(this);
    return handle->ToWordsArray64(sign_bit, word_count, words);
}

void Isolate::ReportExternalAllocationLimitReached()
{
    i::Heap* heap = reinterpret_cast<i::Isolate*>(this)->heap();
    if (heap->gc_state() != i::Heap::NOT_IN_GC)
        return;
    heap->ReportExternalMemoryPressure();
}

void Isolate::CheckMemoryPressure()
{
    i::Heap* heap = reinterpret_cast<i::Isolate*>(this)->heap();
    if (heap->gc_state() != i::Heap::NOT_IN_GC)
        return;
    heap->CheckMemoryPressure();
}

HeapProfiler* Isolate::GetHeapProfiler()
{
    i::HeapProfiler* heap_profiler = reinterpret_cast<i::Isolate*>(this)->heap_profiler();
    return reinterpret_cast<HeapProfiler*>(heap_profiler);
}

void Isolate::SetIdle(bool is_idle)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->SetIdle(is_idle);
}

ArrayBuffer::Allocator* Isolate::GetArrayBufferAllocator()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    return isolate->array_buffer_allocator();
}

bool Isolate::InContext()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    return !isolate->context().is_null();
}

v8::Local<v8::Context> Isolate::GetCurrentContext()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::Context context = isolate->context();
    if (context.is_null())
        return Local<Context>();
    i::Context native_context = context->native_context();
    if (native_context.is_null())
        return Local<Context>();
    return Utils::ToLocal(i::Handle<i::Context>(native_context, isolate));
}

v8::Local<v8::Context> Isolate::GetEnteredContext()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::Handle<i::Object> last = isolate->handle_scope_implementer()->LastEnteredContext();
    if (last.is_null())
        return Local<Context>();
    return Utils::ToLocal(i::Handle<i::Context>::cast(last));
}

v8::Local<v8::Context> Isolate::GetEnteredOrMicrotaskContext()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::Handle<i::Object> last = isolate->handle_scope_implementer()->LastEnteredOrMicrotaskContext();
    if (last.is_null())
        return Local<Context>();
    DCHECK(last->IsNativeContext());
    return Utils::ToLocal(i::Handle<i::Context>::cast(last));
}

v8::Local<v8::Context> Isolate::GetIncumbentContext()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::Handle<i::Context> context = isolate->GetIncumbentContext();
    return Utils::ToLocal(context);
}

v8::Local<Value> Isolate::ThrowException(v8::Local<v8::Value> value)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    ENTER_V8_DO_NOT_USE(isolate);
    // If we're passed an empty handle, we throw an undefined exception
    // to deal more gracefully with out of memory situations.
    if (value.IsEmpty()) {
        isolate->ScheduleThrow(i::ReadOnlyRoots(isolate).undefined_value());
    } else {
        isolate->ScheduleThrow(*Utils::OpenHandle(*value));
    }
    return v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
}

void Isolate::AddGCPrologueCallback(GCCallbackWithData callback, void* data,
    GCType gc_type)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->AddGCPrologueCallback(callback, gc_type, data);
}

void Isolate::RemoveGCPrologueCallback(GCCallbackWithData callback,
    void* data)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->RemoveGCPrologueCallback(callback, data);
}

void Isolate::AddGCEpilogueCallback(GCCallbackWithData callback, void* data,
    GCType gc_type)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->AddGCEpilogueCallback(callback, gc_type, data);
}

void Isolate::RemoveGCEpilogueCallback(GCCallbackWithData callback,
    void* data)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->RemoveGCEpilogueCallback(callback, data);
}

static void CallGCCallbackWithoutData(Isolate* isolate, GCType type,
    GCCallbackFlags flags, void* data)
{
    reinterpret_cast<Isolate::GCCallback>(data)(isolate, type, flags);
}

void Isolate::AddGCPrologueCallback(GCCallback callback, GCType gc_type)
{
    void* data = reinterpret_cast<void*>(callback);
    AddGCPrologueCallback(CallGCCallbackWithoutData, data, gc_type);
}

void Isolate::RemoveGCPrologueCallback(GCCallback callback)
{
    void* data = reinterpret_cast<void*>(callback);
    RemoveGCPrologueCallback(CallGCCallbackWithoutData, data);
}

void Isolate::AddGCEpilogueCallback(GCCallback callback, GCType gc_type)
{
    void* data = reinterpret_cast<void*>(callback);
    AddGCEpilogueCallback(CallGCCallbackWithoutData, data, gc_type);
}

void Isolate::RemoveGCEpilogueCallback(GCCallback callback)
{
    void* data = reinterpret_cast<void*>(callback);
    RemoveGCEpilogueCallback(CallGCCallbackWithoutData, data);
}

void Isolate::SetEmbedderHeapTracer(EmbedderHeapTracer* tracer)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->SetEmbedderHeapTracer(tracer);
}

EmbedderHeapTracer* Isolate::GetEmbedderHeapTracer()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    return isolate->heap()->GetEmbedderHeapTracer();
}

void Isolate::SetGetExternallyAllocatedMemoryInBytesCallback(
    GetExternallyAllocatedMemoryInBytesCallback callback)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->SetGetExternallyAllocatedMemoryInBytesCallback(callback);
}

void Isolate::TerminateExecution()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->stack_guard()->RequestTerminateExecution();
}

bool Isolate::IsExecutionTerminating()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    return IsExecutionTerminatingCheck(isolate);
}

void Isolate::CancelTerminateExecution()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->stack_guard()->ClearTerminateExecution();
    isolate->CancelTerminateExecution();
}

void Isolate::RequestInterrupt(InterruptCallback callback, void* data)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->RequestInterrupt(callback, data);
}

void Isolate::RequestGarbageCollectionForTesting(GarbageCollectionType type)
{
    CHECK(i::FLAG_expose_gc);
    if (type == kMinorGarbageCollection) {
        reinterpret_cast<i::Isolate*>(this)->heap()->CollectGarbage(
            i::NEW_SPACE, i::GarbageCollectionReason::kTesting,
            kGCCallbackFlagForced);
    } else {
        DCHECK_EQ(kFullGarbageCollection, type);
        reinterpret_cast<i::Isolate*>(this)->heap()->PreciseCollectAllGarbage(
            i::Heap::kNoGCFlags, i::GarbageCollectionReason::kTesting,
            kGCCallbackFlagForced);
    }
}

Isolate* Isolate::GetCurrent()
{
    i::Isolate* isolate = i::Isolate::Current();
    return reinterpret_cast<Isolate*>(isolate);
}

// static
Isolate* Isolate::Allocate()
{
    return reinterpret_cast<Isolate*>(i::Isolate::New());
}

// static
// This is separate so that tests can provide a different |isolate|.
void Isolate::Initialize(Isolate* isolate,
    const v8::Isolate::CreateParams& params)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    CHECK_NOT_NULL(params.array_buffer_allocator);
    i_isolate->set_array_buffer_allocator(params.array_buffer_allocator);
    if (params.snapshot_blob != nullptr) {
        i_isolate->set_snapshot_blob(params.snapshot_blob);
    } else {
        i_isolate->set_snapshot_blob(i::Snapshot::DefaultSnapshotBlob());
    }
    auto code_event_handler = params.code_event_handler;
#ifdef ENABLE_GDB_JIT_INTERFACE
    if (code_event_handler == nullptr && i::FLAG_gdbjit) {
        code_event_handler = i::GDBJITInterface::EventHandler;
    }
#endif // ENABLE_GDB_JIT_INTERFACE
    if (code_event_handler) {
        i_isolate->InitializeLoggingAndCounters();
        i_isolate->logger()->SetCodeEventHandler(kJitCodeEventDefault,
            code_event_handler);
    }
    if (params.counter_lookup_callback) {
        isolate->SetCounterFunction(params.counter_lookup_callback);
    }

    if (params.create_histogram_callback) {
        isolate->SetCreateHistogramFunction(params.create_histogram_callback);
    }

    if (params.add_histogram_sample_callback) {
        isolate->SetAddHistogramSampleFunction(
            params.add_histogram_sample_callback);
    }

    i_isolate->set_api_external_references(params.external_references);
    i_isolate->set_allow_atomics_wait(params.allow_atomics_wait);

    SetResourceConstraints(i_isolate, params.constraints);
    // TODO(jochen): Once we got rid of Isolate::Current(), we can remove this.
    Isolate::Scope isolate_scope(isolate);
    if (!i::Snapshot::Initialize(i_isolate)) {
        // If snapshot data was provided and we failed to deserialize it must
        // have been corrupted.
        if (i_isolate->snapshot_blob() != nullptr) {
            FATAL(
                "Failed to deserialize the V8 snapshot blob. This can mean that the "
                "snapshot blob file is corrupted or missing.");
        }
        base::ElapsedTimer timer;
        //if (i::FLAG_profile_deserialization)
            timer.Start();
        i_isolate->InitWithoutSnapshot();
        //if (i::FLAG_profile_deserialization) {
            double ms = timer.Elapsed().InMillisecondsF();
            i::PrintF("[Initializing isolate from scratch took %0.3f ms]\n", ms);
        //}
    }
    i_isolate->set_only_terminate_in_safe_scope(
        params.only_terminate_in_safe_scope);
}

Isolate* Isolate::New(const Isolate::CreateParams& params)
{
    Isolate* isolate = Allocate();
    Initialize(isolate, params);
    return isolate;
}

void Isolate::Dispose()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    if (!Utils::ApiCheck(!isolate->IsInUse(),
            "v8::Isolate::Dispose()",
            "Disposing the isolate that is entered by a thread.")) {
        return;
    }
    i::Isolate::Delete(isolate);
}

void Isolate::DumpAndResetStats()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->DumpAndResetStats();
}

void Isolate::DiscardThreadSpecificMetadata()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->DiscardPerThreadDataForThisThread();
}

void Isolate::Enter()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->Enter();
}

void Isolate::Exit()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->Exit();
}

void Isolate::SetAbortOnUncaughtExceptionCallback(
    AbortOnUncaughtExceptionCallback callback)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->SetAbortOnUncaughtExceptionCallback(callback);
}

void Isolate::SetHostImportModuleDynamicallyCallback(
    HostImportModuleDynamicallyCallback callback)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->SetHostImportModuleDynamicallyCallback(callback);
}

void Isolate::SetHostInitializeImportMetaObjectCallback(
    HostInitializeImportMetaObjectCallback callback)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->SetHostInitializeImportMetaObjectCallback(callback);
}

void Isolate::SetPrepareStackTraceCallback(PrepareStackTraceCallback callback)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->SetPrepareStackTraceCallback(callback);
}

Isolate::DisallowJavascriptExecutionScope::DisallowJavascriptExecutionScope(
    Isolate* isolate,
    Isolate::DisallowJavascriptExecutionScope::OnFailure on_failure)
    : on_failure_(on_failure)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    switch (on_failure_) {
    case CRASH_ON_FAILURE:
        internal_ = reinterpret_cast<void*>(
            new i::DisallowJavascriptExecution(i_isolate));
        break;
    case THROW_ON_FAILURE:
        DCHECK_EQ(THROW_ON_FAILURE, on_failure);
        internal_ = reinterpret_cast<void*>(new i::ThrowOnJavascriptExecution(i_isolate));
        break;
    case DUMP_ON_FAILURE:
        internal_ = reinterpret_cast<void*>(new i::DumpOnJavascriptExecution(i_isolate));
        break;
    default:
        UNREACHABLE();
        break;
    }
}

Isolate::DisallowJavascriptExecutionScope::~DisallowJavascriptExecutionScope()
{
    switch (on_failure_) {
    case CRASH_ON_FAILURE:
        delete reinterpret_cast<i::DisallowJavascriptExecution*>(internal_);
        break;
    case THROW_ON_FAILURE:
        delete reinterpret_cast<i::ThrowOnJavascriptExecution*>(internal_);
        break;
    case DUMP_ON_FAILURE:
        delete reinterpret_cast<i::DumpOnJavascriptExecution*>(internal_);
        break;
    default:
        UNREACHABLE();
        break;
    }
}

Isolate::AllowJavascriptExecutionScope::AllowJavascriptExecutionScope(
    Isolate* isolate)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    internal_assert_ = reinterpret_cast<void*>(
        new i::AllowJavascriptExecution(i_isolate));
    internal_throws_ = reinterpret_cast<void*>(
        new i::NoThrowOnJavascriptExecution(i_isolate));
    internal_dump_ = reinterpret_cast<void*>(new i::NoDumpOnJavascriptExecution(i_isolate));
}

Isolate::AllowJavascriptExecutionScope::~AllowJavascriptExecutionScope()
{
    delete reinterpret_cast<i::AllowJavascriptExecution*>(internal_assert_);
    delete reinterpret_cast<i::NoThrowOnJavascriptExecution*>(internal_throws_);
    delete reinterpret_cast<i::NoDumpOnJavascriptExecution*>(internal_dump_);
}

Isolate::SuppressMicrotaskExecutionScope::SuppressMicrotaskExecutionScope(
    Isolate* isolate)
    : isolate_(reinterpret_cast<i::Isolate*>(isolate))
    , microtask_queue_(isolate_->default_microtask_queue())
{
    isolate_->handle_scope_implementer()->IncrementCallDepth();
    microtask_queue_->IncrementMicrotasksSuppressions();
}

Isolate::SuppressMicrotaskExecutionScope::~SuppressMicrotaskExecutionScope()
{
    microtask_queue_->DecrementMicrotasksSuppressions();
    isolate_->handle_scope_implementer()->DecrementCallDepth();
}

Isolate::SafeForTerminationScope::SafeForTerminationScope(v8::Isolate* isolate)
    : isolate_(reinterpret_cast<i::Isolate*>(isolate))
    , prev_value_(isolate_->next_v8_call_is_safe_for_termination())
{
    isolate_->set_next_v8_call_is_safe_for_termination(true);
}

Isolate::SafeForTerminationScope::~SafeForTerminationScope()
{
    isolate_->set_next_v8_call_is_safe_for_termination(prev_value_);
}

i::Address* Isolate::GetDataFromSnapshotOnce(size_t index)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(this);
    i::FixedArray list = i_isolate->heap()->serialized_objects();
    return GetSerializedDataFromFixedArray(i_isolate, list, index);
}

void Isolate::GetHeapStatistics(HeapStatistics* heap_statistics)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::Heap* heap = isolate->heap();
    heap_statistics->total_heap_size_ = heap->CommittedMemory();
    heap_statistics->total_heap_size_executable_ = heap->CommittedMemoryExecutable();
    heap_statistics->total_physical_size_ = heap->CommittedPhysicalMemory();
    heap_statistics->total_available_size_ = heap->Available();
    heap_statistics->used_heap_size_ = heap->SizeOfObjects();
    heap_statistics->heap_size_limit_ = heap->MaxReserved();
    // TODO(7424): There is no public API for the {WasmEngine} yet. Once such an
    // API becomes available we should report the malloced memory separately. For
    // now we just add the values, thereby over-approximating the peak slightly.
    heap_statistics->malloced_memory_ = isolate->allocator()->GetCurrentMemoryUsage() + isolate->wasm_engine()->allocator()->GetCurrentMemoryUsage();
    heap_statistics->external_memory_ = isolate->heap()->backing_store_bytes();
    heap_statistics->peak_malloced_memory_ = isolate->allocator()->GetMaxMemoryUsage() + isolate->wasm_engine()->allocator()->GetMaxMemoryUsage();
    heap_statistics->number_of_native_contexts_ = heap->NumberOfNativeContexts();
    heap_statistics->number_of_detached_contexts_ = heap->NumberOfDetachedContexts();
    heap_statistics->does_zap_garbage_ = heap->ShouldZapGarbage();
}

size_t Isolate::NumberOfHeapSpaces()
{
    return i::LAST_SPACE - i::FIRST_SPACE + 1;
}

bool Isolate::GetHeapSpaceStatistics(HeapSpaceStatistics* space_statistics,
    size_t index)
{
    if (!space_statistics)
        return false;
    if (!i::Heap::IsValidAllocationSpace(static_cast<i::AllocationSpace>(index)))
        return false;

    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::Heap* heap = isolate->heap();
    i::Space* space = heap->space(static_cast<int>(index));

    space_statistics->space_name_ = i::Heap::GetSpaceName(static_cast<i::AllocationSpace>(index));
    space_statistics->space_size_ = space->CommittedMemory();
    space_statistics->space_used_size_ = space->SizeOfObjects();
    space_statistics->space_available_size_ = space->Available();
    space_statistics->physical_space_size_ = space->CommittedPhysicalMemory();
    return true;
}

size_t Isolate::NumberOfTrackedHeapObjectTypes()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::Heap* heap = isolate->heap();
    return heap->NumberOfTrackedHeapObjectTypes();
}

bool Isolate::GetHeapObjectStatisticsAtLastGC(
    HeapObjectStatistics* object_statistics, size_t type_index)
{
    if (!object_statistics)
        return false;
    if (V8_LIKELY(!i::TracingFlags::is_gc_stats_enabled()))
        return false;

    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::Heap* heap = isolate->heap();
    if (type_index >= heap->NumberOfTrackedHeapObjectTypes())
        return false;

    const char* object_type;
    const char* object_sub_type;
    size_t object_count = heap->ObjectCountAtLastGC(type_index);
    size_t object_size = heap->ObjectSizeAtLastGC(type_index);
    if (!heap->GetObjectTypeName(type_index, &object_type, &object_sub_type)) {
        // There should be no objects counted when the type is unknown.
        DCHECK_EQ(object_count, 0U);
        DCHECK_EQ(object_size, 0U);
        return false;
    }

    object_statistics->object_type_ = object_type;
    object_statistics->object_sub_type_ = object_sub_type;
    object_statistics->object_count_ = object_count;
    object_statistics->object_size_ = object_size;
    return true;
}

bool Isolate::GetHeapCodeAndMetadataStatistics(
    HeapCodeStatistics* code_statistics)
{
    if (!code_statistics)
        return false;

    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->CollectCodeStatistics();

    code_statistics->code_and_metadata_size_ = isolate->code_and_metadata_size();
    code_statistics->bytecode_and_metadata_size_ = isolate->bytecode_and_metadata_size();
    code_statistics->external_script_source_size_ = isolate->external_script_source_size();
    return true;
}

void Isolate::GetStackSample(const RegisterState& state, void** frames,
    size_t frames_limit, SampleInfo* sample_info)
{
    RegisterState regs = state;
    if (TickSample::GetStackSample(this, &regs, TickSample::kSkipCEntryFrame,
            frames, frames_limit, sample_info)) {
        return;
    }
    sample_info->frames_count = 0;
    sample_info->vm_state = OTHER;
    sample_info->external_callback_entry = nullptr;
}

size_t Isolate::NumberOfPhantomHandleResetsSinceLastCall()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    return isolate->global_handles()->GetAndResetGlobalHandleResetCount();
}

void Isolate::SetEventLogger(LogEventCallback that)
{
    // Do not overwrite the event logger if we want to log explicitly.
    if (i::FLAG_log_internal_timer_events)
        return;
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->set_event_logger(that);
}

void Isolate::AddBeforeCallEnteredCallback(BeforeCallEnteredCallback callback)
{
    if (callback == nullptr)
        return;
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->AddBeforeCallEnteredCallback(callback);
}

void Isolate::RemoveBeforeCallEnteredCallback(
    BeforeCallEnteredCallback callback)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->RemoveBeforeCallEnteredCallback(callback);
}

void Isolate::AddCallCompletedCallback(CallCompletedCallback callback)
{
    if (callback == nullptr)
        return;
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->AddCallCompletedCallback(callback);
}

void Isolate::RemoveCallCompletedCallback(CallCompletedCallback callback)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->RemoveCallCompletedCallback(callback);
}

void Isolate::AtomicsWaitWakeHandle::Wake()
{
    reinterpret_cast<i::AtomicsWaitWakeHandle*>(this)->Wake();
}

void Isolate::SetAtomicsWaitCallback(AtomicsWaitCallback callback, void* data)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->SetAtomicsWaitCallback(callback, data);
}

void Isolate::SetPromiseHook(PromiseHook hook)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->SetPromiseHook(hook);
}

void Isolate::SetPromiseRejectCallback(PromiseRejectCallback callback)
{
    if (callback == nullptr)
        return;
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->SetPromiseRejectCallback(callback);
}

void Isolate::RunMicrotasks()
{
    DCHECK_NE(MicrotasksPolicy::kScoped, GetMicrotasksPolicy());
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->default_microtask_queue()->RunMicrotasks(isolate);
}

void Isolate::EnqueueMicrotask(Local<Function> v8_function)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::Handle<i::JSReceiver> function = Utils::OpenHandle(*v8_function);
    i::Handle<i::NativeContext> handler_context;
    if (!i::JSReceiver::GetContextForMicrotask(function).ToHandle(
            &handler_context))
        handler_context = isolate->native_context();
    MicrotaskQueue* microtask_queue = handler_context->microtask_queue();
    if (microtask_queue)
        microtask_queue->EnqueueMicrotask(this, v8_function);
}

void Isolate::EnqueueMicrotask(MicrotaskCallback callback, void* data)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::HandleScope scope(isolate);
    i::Handle<i::CallbackTask> microtask = isolate->factory()->NewCallbackTask(
        isolate->factory()->NewForeign(reinterpret_cast<i::Address>(callback)),
        isolate->factory()->NewForeign(reinterpret_cast<i::Address>(data)));
    isolate->default_microtask_queue()->EnqueueMicrotask(*microtask);
}

void Isolate::SetMicrotasksPolicy(MicrotasksPolicy policy)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->default_microtask_queue()->set_microtasks_policy(policy);
}

MicrotasksPolicy Isolate::GetMicrotasksPolicy() const
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(const_cast<Isolate*>(this));
    return isolate->default_microtask_queue()->microtasks_policy();
}

namespace {

    void MicrotasksCompletedCallbackAdapter(v8::Isolate* isolate, void* data)
    {
        auto callback = reinterpret_cast<void (*)(v8::Isolate*)>(data);
        callback(isolate);
    }

} // namespace

void Isolate::AddMicrotasksCompletedCallback(
    MicrotasksCompletedCallback callback)
{
    DCHECK(callback);
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->default_microtask_queue()->AddMicrotasksCompletedCallback(
        &MicrotasksCompletedCallbackAdapter, reinterpret_cast<void*>(callback));
}

void Isolate::AddMicrotasksCompletedCallback(
    MicrotasksCompletedCallbackWithData callback, void* data)
{
    DCHECK(callback);
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->default_microtask_queue()->AddMicrotasksCompletedCallback(callback,
        data);
}

void Isolate::RemoveMicrotasksCompletedCallback(
    MicrotasksCompletedCallback callback)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->default_microtask_queue()->RemoveMicrotasksCompletedCallback(
        &MicrotasksCompletedCallbackAdapter, reinterpret_cast<void*>(callback));
}

void Isolate::RemoveMicrotasksCompletedCallback(
    MicrotasksCompletedCallbackWithData callback, void* data)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->default_microtask_queue()->RemoveMicrotasksCompletedCallback(
        callback, data);
}

void Isolate::SetUseCounterCallback(UseCounterCallback callback)
{
    reinterpret_cast<i::Isolate*>(this)->SetUseCounterCallback(callback);
}

void Isolate::SetCounterFunction(CounterLookupCallback callback)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->counters()->ResetCounterFunction(callback);
}

void Isolate::SetCreateHistogramFunction(CreateHistogramCallback callback)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->counters()->ResetCreateHistogramFunction(callback);
}

void Isolate::SetAddHistogramSampleFunction(
    AddHistogramSampleCallback callback)
{
    reinterpret_cast<i::Isolate*>(this)
        ->counters()
        ->SetAddHistogramSampleFunction(callback);
}

bool Isolate::IdleNotificationDeadline(double deadline_in_seconds)
{
    // Returning true tells the caller that it need not
    // continue to call IdleNotification.
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    if (!i::FLAG_use_idle_notification)
        return true;
    return isolate->heap()->IdleNotification(deadline_in_seconds);
}

void Isolate::LowMemoryNotification()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    {
        i::HistogramTimerScope idle_notification_scope(
            isolate->counters()->gc_low_memory_notification());
        TRACE_EVENT0("v8", "V8.GCLowMemoryNotification");
        isolate->heap()->CollectAllAvailableGarbage(
            i::GarbageCollectionReason::kLowMemoryNotification);
    }
    {
        i::HeapIterator iterator(isolate->heap());
        for (i::HeapObject obj = iterator.next(); !obj.is_null();
             obj = iterator.next()) {
            if (obj->IsAbstractCode()) {
                i::AbstractCode::cast(obj)->DropStackFrameCache();
            }
        }
    }
}

int Isolate::ContextDisposedNotification(bool dependant_context)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    if (!dependant_context) {
        // We left the current context, we can abort all WebAssembly compilations on
        // that isolate.
        isolate->wasm_engine()->DeleteCompileJobsOnIsolate(isolate);
    }
    // TODO(ahaas): move other non-heap activity out of the heap call.
    return isolate->heap()->NotifyContextDisposed(dependant_context);
}

void Isolate::IsolateInForegroundNotification()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    return isolate->IsolateInForegroundNotification();
}

void Isolate::IsolateInBackgroundNotification()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    return isolate->IsolateInBackgroundNotification();
}

void Isolate::MemoryPressureNotification(MemoryPressureLevel level)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    bool on_isolate_thread = v8::Locker::IsActive()
        ? isolate->thread_manager()->IsLockedByCurrentThread()
        : i::ThreadId::Current() == isolate->thread_id();
    isolate->heap()->MemoryPressureNotification(level, on_isolate_thread);
}

void Isolate::EnableMemorySavingsMode()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->EnableMemorySavingsMode();
}

void Isolate::DisableMemorySavingsMode()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->DisableMemorySavingsMode();
}

void Isolate::SetRAILMode(RAILMode rail_mode)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    return isolate->SetRAILMode(rail_mode);
}

void Isolate::IncreaseHeapLimitForDebugging()
{
    // No-op.
}

void Isolate::RestoreOriginalHeapLimit()
{
    // No-op.
}

bool Isolate::IsHeapLimitIncreasedForDebugging() { return false; }

void Isolate::SetJitCodeEventHandler(JitCodeEventOptions options,
    JitCodeEventHandler event_handler)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    // Ensure that logging is initialized for our isolate.
    isolate->InitializeLoggingAndCounters();
    isolate->logger()->SetCodeEventHandler(options, event_handler);
}

void Isolate::SetStackLimit(uintptr_t stack_limit)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    CHECK(stack_limit);
    isolate->stack_guard()->SetStackLimit(stack_limit);
}

void Isolate::GetCodeRange(void** start, size_t* length_in_bytes)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    const base::AddressRegion& code_range = isolate->heap()->memory_allocator()->code_range();
    *start = reinterpret_cast<void*>(code_range.begin());
    *length_in_bytes = code_range.size();
}

UnwindState Isolate::GetUnwindState()
{
    UnwindState unwind_state;
    void* code_range_start;
    GetCodeRange(&code_range_start, &unwind_state.code_range.length_in_bytes);
    unwind_state.code_range.start = code_range_start;

    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    unwind_state.embedded_code_range.start = reinterpret_cast<const void*>(isolate->embedded_blob());
    unwind_state.embedded_code_range.length_in_bytes = isolate->embedded_blob_size();

    i::Code js_entry = isolate->heap()->builtin(i::Builtins::kJSEntry);
    unwind_state.js_entry_stub.code.start = reinterpret_cast<const void*>(js_entry->InstructionStart());
    unwind_state.js_entry_stub.code.length_in_bytes = js_entry->InstructionSize();

    return unwind_state;
}

#define CALLBACK_SETTER(ExternalName, Type, InternalName)          \
    void Isolate::Set##ExternalName(Type callback)                 \
    {                                                              \
        i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this); \
        isolate->set_##InternalName(callback);                     \
    }

CALLBACK_SETTER(FatalErrorHandler, FatalErrorCallback, exception_behavior)
CALLBACK_SETTER(OOMErrorHandler, OOMErrorCallback, oom_behavior)
CALLBACK_SETTER(AllowCodeGenerationFromStringsCallback,
    AllowCodeGenerationFromStringsCallback, allow_code_gen_callback)
CALLBACK_SETTER(AllowWasmCodeGenerationCallback,
    AllowWasmCodeGenerationCallback, allow_wasm_code_gen_callback)

CALLBACK_SETTER(WasmModuleCallback, ExtensionCallback, wasm_module_callback)
CALLBACK_SETTER(WasmInstanceCallback, ExtensionCallback, wasm_instance_callback)

CALLBACK_SETTER(WasmStreamingCallback, WasmStreamingCallback,
    wasm_streaming_callback)

CALLBACK_SETTER(WasmThreadsEnabledCallback, WasmThreadsEnabledCallback,
    wasm_threads_enabled_callback)

void Isolate::AddNearHeapLimitCallback(v8::NearHeapLimitCallback callback,
    void* data)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->AddNearHeapLimitCallback(callback, data);
}

void Isolate::RemoveNearHeapLimitCallback(v8::NearHeapLimitCallback callback,
    size_t heap_limit)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->RemoveNearHeapLimitCallback(callback, heap_limit);
}

void Isolate::AutomaticallyRestoreInitialHeapLimit(double threshold_percent)
{
    DCHECK_GT(threshold_percent, 0.0);
    DCHECK_LT(threshold_percent, 1.0);
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->AutomaticallyRestoreInitialHeapLimit(threshold_percent);
}

bool Isolate::IsDead()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    return isolate->IsDead();
}

bool Isolate::AddMessageListener(MessageCallback that, Local<Value> data)
{
    return AddMessageListenerWithErrorLevel(that, kMessageError, data);
}

bool Isolate::AddMessageListenerWithErrorLevel(MessageCallback that,
    int message_levels,
    Local<Value> data)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    i::Handle<i::TemplateList> list = isolate->factory()->message_listeners();
    i::Handle<i::FixedArray> listener = isolate->factory()->NewFixedArray(3);
    i::Handle<i::Foreign> foreign = isolate->factory()->NewForeign(FUNCTION_ADDR(that));
    listener->set(0, *foreign);
    listener->set(1, data.IsEmpty() ? i::ReadOnlyRoots(isolate).undefined_value() : *Utils::OpenHandle(*data));
    listener->set(2, i::Smi::FromInt(message_levels));
    list = i::TemplateList::Add(isolate, list, listener);
    isolate->heap()->SetMessageListeners(*list);
    return true;
}

void Isolate::RemoveMessageListeners(MessageCallback that)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope scope(isolate);
    i::DisallowHeapAllocation no_gc;
    i::TemplateList listeners = isolate->heap()->message_listeners();
    for (int i = 0; i < listeners->length(); i++) {
        if (listeners->get(i)->IsUndefined(isolate))
            continue; // skip deleted ones
        i::FixedArray listener = i::FixedArray::cast(listeners->get(i));
        i::Foreign callback_obj = i::Foreign::cast(listener->get(0));
        if (callback_obj->foreign_address() == FUNCTION_ADDR(that)) {
            listeners->set(i, i::ReadOnlyRoots(isolate).undefined_value());
        }
    }
}

void Isolate::SetFailedAccessCheckCallbackFunction(
    FailedAccessCheckCallback callback)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->SetFailedAccessCheckCallback(callback);
}

void Isolate::SetCaptureStackTraceForUncaughtExceptions(
    bool capture, int frame_limit, StackTrace::StackTraceOptions options)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->SetCaptureStackTraceForUncaughtExceptions(capture, frame_limit,
        options);
}

void Isolate::VisitExternalResources(ExternalResourceVisitor* visitor)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->heap()->VisitExternalResources(visitor);
}

bool Isolate::IsInUse()
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    return isolate->IsInUse();
}

void Isolate::VisitHandlesWithClassIds(PersistentHandleVisitor* visitor)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::DisallowHeapAllocation no_allocation;
    isolate->global_handles()->IterateAllRootsWithClassIds(visitor);
}

void Isolate::VisitWeakHandles(PersistentHandleVisitor* visitor)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    i::DisallowHeapAllocation no_allocation;
    isolate->global_handles()->IterateYoungWeakRootsWithClassIds(visitor);
}

void Isolate::SetAllowAtomicsWait(bool allow)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
    isolate->set_allow_atomics_wait(allow);
}

void v8::Isolate::DateTimeConfigurationChangeNotification(
    TimeZoneDetection time_zone_detection)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(this);
    LOG_API(i_isolate, Isolate, DateTimeConfigurationChangeNotification);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i_isolate->date_cache()->ResetDateCache(
        static_cast<base::TimezoneCache::TimeZoneDetection>(time_zone_detection));
#ifdef V8_INTL_SUPPORT
    i_isolate->clear_cached_icu_object(
        i::Isolate::ICUObjectCacheType::kDefaultSimpleDateFormat);
    i_isolate->clear_cached_icu_object(
        i::Isolate::ICUObjectCacheType::kDefaultSimpleDateFormatForTime);
    i_isolate->clear_cached_icu_object(
        i::Isolate::ICUObjectCacheType::kDefaultSimpleDateFormatForDate);
#endif // V8_INTL_SUPPORT
}

void v8::Isolate::LocaleConfigurationChangeNotification()
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(this);
    LOG_API(i_isolate, Isolate, LocaleConfigurationChangeNotification);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);

#ifdef V8_INTL_SUPPORT
    i_isolate->ResetDefaultLocale();
#endif // V8_INTL_SUPPORT
}

// static
std::unique_ptr<MicrotaskQueue> MicrotaskQueue::New(Isolate* isolate /*, MicrotasksPolicy policy*/)
{
    MicrotasksPolicy policy = MicrotasksPolicy::kExplicit;
    auto microtask_queue = i::MicrotaskQueue::New(reinterpret_cast<i::Isolate*>(isolate));
    microtask_queue->set_microtasks_policy(policy);
    return microtask_queue;
}

MicrotasksScope::MicrotasksScope(Isolate* isolate, MicrotasksScope::Type type)
    : MicrotasksScope(isolate, nullptr, type)
{
}

MicrotasksScope::MicrotasksScope(Isolate* isolate,
    MicrotaskQueue* microtask_queue,
    MicrotasksScope::Type type)
    : isolate_(reinterpret_cast<i::Isolate*>(isolate))
    , microtask_queue_(microtask_queue
              ? static_cast<i::MicrotaskQueue*>(microtask_queue)
              : isolate_->default_microtask_queue())
    , run_(type == MicrotasksScope::kRunMicrotasks)
{
    if (run_)
        microtask_queue_->IncrementMicrotasksScopeDepth();
#ifdef DEBUG
    if (!run_)
        microtask_queue_->IncrementDebugMicrotasksScopeDepth();
#endif
}

MicrotasksScope::~MicrotasksScope()
{
    if (run_) {
        microtask_queue_->DecrementMicrotasksScopeDepth();
        if (MicrotasksPolicy::kScoped == microtask_queue_->microtasks_policy()) {
            microtask_queue_->PerformCheckpoint(reinterpret_cast<Isolate*>(isolate_));
        }
    }
#ifdef DEBUG
    if (!run_)
        microtask_queue_->DecrementDebugMicrotasksScopeDepth();
#endif
}

void MicrotasksScope::PerformCheckpoint(Isolate* v8_isolate)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    auto* microtask_queue = isolate->default_microtask_queue();
    microtask_queue->PerformCheckpoint(v8_isolate);
}

int MicrotasksScope::GetCurrentDepth(Isolate* v8_isolate)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    auto* microtask_queue = isolate->default_microtask_queue();
    return microtask_queue->GetMicrotasksScopeDepth();
}

bool MicrotasksScope::IsRunningMicrotasks(Isolate* v8_isolate)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    auto* microtask_queue = isolate->default_microtask_queue();
    return microtask_queue->IsRunningMicrotasks();
}

String::Utf8Value::Utf8Value(v8::Isolate* isolate, v8::Local<v8::Value> obj)
    : str_(nullptr)
    , length_(0)
{
    if (obj.IsEmpty())
        return;
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ENTER_V8_DO_NOT_USE(i_isolate);
    i::HandleScope scope(i_isolate);
    Local<Context> context = isolate->GetCurrentContext();
    TryCatch try_catch(isolate);
    Local<String> str;
    if (!obj->ToString(context).ToLocal(&str))
        return;
    length_ = str->Utf8Length(isolate);
    str_ = i::NewArray<char>(length_ + 1);
    str->WriteUtf8(isolate, str_);
}

String::Utf8Value::~Utf8Value()
{
    i::DeleteArray(str_);
}

String::Value::Value(v8::Isolate* isolate, v8::Local<v8::Value> obj)
    : str_(nullptr)
    , length_(0)
{
    if (obj.IsEmpty())
        return;
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ENTER_V8_DO_NOT_USE(i_isolate);
    i::HandleScope scope(i_isolate);
    Local<Context> context = isolate->GetCurrentContext();
    TryCatch try_catch(isolate);
    Local<String> str;
    if (!obj->ToString(context).ToLocal(&str))
        return;
    length_ = str->Length();
    str_ = i::NewArray<uint16_t>(length_ + 1);
    str->Write(isolate, str_);
}

String::Value::~Value()
{
    i::DeleteArray(str_);
}

#define DEFINE_ERROR(NAME, name)                                               \
    Local<Value> Exception::NAME(v8::Local<v8::String> raw_message)            \
    {                                                                          \
        i::Isolate* isolate = i::Isolate::Current();                           \
        LOG_API(isolate, NAME, New);                                           \
        ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);                              \
        i::Object error;                                                       \
        {                                                                      \
            i::HandleScope scope(isolate);                                     \
            i::Handle<i::String> message = Utils::OpenHandle(*raw_message);    \
            i::Handle<i::JSFunction> constructor = isolate->name##_function(); \
            error = *isolate->factory()->NewError(constructor, message);       \
        }                                                                      \
        i::Handle<i::Object> result(error, isolate);                           \
        return Utils::ToLocal(result);                                         \
    }

DEFINE_ERROR(RangeError, range_error)
DEFINE_ERROR(ReferenceError, reference_error)
DEFINE_ERROR(SyntaxError, syntax_error)
DEFINE_ERROR(TypeError, type_error)
DEFINE_ERROR(Error, error)

#undef DEFINE_ERROR

Local<Message> Exception::CreateMessage(Isolate* isolate,
    Local<Value> exception)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(*exception);
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::HandleScope scope(i_isolate);
    return Utils::MessageToLocal(
        scope.CloseAndEscape(i_isolate->CreateMessage(obj, nullptr)));
}

Local<StackTrace> Exception::GetStackTrace(Local<Value> exception)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(*exception);
    if (!obj->IsJSObject())
        return Local<StackTrace>();
    i::Handle<i::JSObject> js_obj = i::Handle<i::JSObject>::cast(obj);
    i::Isolate* isolate = js_obj->GetIsolate();
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    return Utils::StackTraceToLocal(isolate->GetDetailedStackTrace(js_obj));
}

// --- D e b u g   S u p p o r t ---

void debug::SetContextId(Local<Context> context, int id)
{
    Utils::OpenHandle(*context)->set_debug_context_id(i::Smi::FromInt(id));
}

int debug::GetContextId(Local<Context> context)
{
    i::Object value = Utils::OpenHandle(*context)->debug_context_id();
    return (value->IsSmi()) ? i::Smi::ToInt(value) : 0;
}

void debug::SetInspector(Isolate* isolate,
    v8_inspector::V8Inspector* inspector)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i_isolate->set_inspector(inspector);
}

v8_inspector::V8Inspector* debug::GetInspector(Isolate* isolate)
{
    return reinterpret_cast<i::Isolate*>(isolate)->inspector();
}

void debug::SetBreakOnNextFunctionCall(Isolate* isolate)
{
    reinterpret_cast<i::Isolate*>(isolate)->debug()->SetBreakOnNextFunctionCall();
}

void debug::ClearBreakOnNextFunctionCall(Isolate* isolate)
{
    reinterpret_cast<i::Isolate*>(isolate)
        ->debug()
        ->ClearBreakOnNextFunctionCall();
}

MaybeLocal<Array> debug::GetInternalProperties(Isolate* v8_isolate,
    Local<Value> value)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::Handle<i::Object> val = Utils::OpenHandle(*value);
    i::Handle<i::JSArray> result;
    if (!i::Runtime::GetInternalProperties(isolate, val).ToHandle(&result))
        return MaybeLocal<Array>();
    return Utils::ToLocal(result);
}

MaybeLocal<Array> debug::GetPrivateFields(Local<Context> context,
    Local<Object> value)
{
    PREPARE_FOR_EXECUTION(context, debug, GetPrivateFields, Array);
    i::Handle<i::JSReceiver> val = Utils::OpenHandle(*value);
    i::Handle<i::JSArray> result;
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    has_pending_exception = !(internal_isolate->debug()->GetPrivateFields(val).ToHandle(&result));
    RETURN_ON_FAILED_EXECUTION(Array);
    RETURN_ESCAPED(Utils::ToLocal(result));
}

void debug::ChangeBreakOnException(Isolate* isolate, ExceptionBreakState type)
{
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    internal_isolate->debug()->ChangeBreakOnException(
        i::BreakException, type == BreakOnAnyException);
    internal_isolate->debug()->ChangeBreakOnException(i::BreakUncaughtException,
        type != NoBreakOnException);
}

void debug::SetBreakPointsActive(Isolate* v8_isolate, bool is_active)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    isolate->debug()->set_break_points_active(is_active);
}

void debug::PrepareStep(Isolate* v8_isolate, StepAction action)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_DO_NOT_USE(isolate);
    CHECK(isolate->debug()->CheckExecutionState());
    // Clear all current stepping setup.
    isolate->debug()->ClearStepping();
    // Prepare step.
    isolate->debug()->PrepareStep(static_cast<i::StepAction>(action));
}

void debug::ClearStepping(Isolate* v8_isolate)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    // Clear all current stepping setup.
    isolate->debug()->ClearStepping();
}

void debug::BreakRightNow(Isolate* v8_isolate)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_DO_NOT_USE(isolate);
    isolate->debug()->HandleDebugBreak(i::kIgnoreIfAllFramesBlackboxed);
}

bool debug::AllFramesOnStackAreBlackboxed(Isolate* v8_isolate)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_DO_NOT_USE(isolate);
    return isolate->debug()->AllFramesOnStackAreBlackboxed();
}

v8::Isolate* debug::Script::GetIsolate() const
{
    return reinterpret_cast<v8::Isolate*>(Utils::OpenHandle(this)->GetIsolate());
}

ScriptOriginOptions debug::Script::OriginOptions() const
{
    return Utils::OpenHandle(this)->origin_options();
}

bool debug::Script::WasCompiled() const
{
    return Utils::OpenHandle(this)->compilation_state() == i::Script::COMPILATION_STATE_COMPILED;
}

bool debug::Script::IsEmbedded() const
{
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    return script->context_data() == script->GetReadOnlyRoots().uninitialized_symbol();
}

int debug::Script::Id() const { return Utils::OpenHandle(this)->id(); }

int debug::Script::LineOffset() const
{
    return Utils::OpenHandle(this)->line_offset();
}

int debug::Script::ColumnOffset() const
{
    return Utils::OpenHandle(this)->column_offset();
}

std::vector<int> debug::Script::LineEnds() const
{
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    if (script->type() == i::Script::TYPE_WASM && this->SourceMappingURL().IsEmpty()) {
        return std::vector<int>();
    }
    i::Isolate* isolate = script->GetIsolate();
    i::HandleScope scope(isolate);
    i::Script::InitLineEnds(script);
    CHECK(script->line_ends()->IsFixedArray());
    i::Handle<i::FixedArray> line_ends(i::FixedArray::cast(script->line_ends()),
        isolate);
    std::vector<int> result(line_ends->length());
    for (int i = 0; i < line_ends->length(); ++i) {
        i::Smi line_end = i::Smi::cast(line_ends->get(i));
        result[i] = line_end->value();
    }
    return result;
}

MaybeLocal<String> debug::Script::Name() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    i::HandleScope handle_scope(isolate);
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    i::Handle<i::Object> value(script->name(), isolate);
    if (!value->IsString())
        return MaybeLocal<String>();
    return Utils::ToLocal(
        handle_scope.CloseAndEscape(i::Handle<i::String>::cast(value)));
}

MaybeLocal<String> debug::Script::SourceURL() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    i::HandleScope handle_scope(isolate);
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    i::Handle<i::Object> value(script->source_url(), isolate);
    if (!value->IsString())
        return MaybeLocal<String>();
    return Utils::ToLocal(
        handle_scope.CloseAndEscape(i::Handle<i::String>::cast(value)));
}

MaybeLocal<String> debug::Script::SourceMappingURL() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    i::HandleScope handle_scope(isolate);
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    i::Handle<i::Object> value(script->source_mapping_url(), isolate);
    if (!value->IsString())
        return MaybeLocal<String>();
    return Utils::ToLocal(
        handle_scope.CloseAndEscape(i::Handle<i::String>::cast(value)));
}

Maybe<int> debug::Script::ContextId() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    i::HandleScope handle_scope(isolate);
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    i::Object value = script->context_data();
    if (value->IsSmi())
        return Just(i::Smi::ToInt(value));
    return Nothing<int>();
}

MaybeLocal<String> debug::Script::Source() const
{
    i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
    i::HandleScope handle_scope(isolate);
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    i::Handle<i::Object> value(script->source(), isolate);
    if (!value->IsString())
        return MaybeLocal<String>();
    return Utils::ToLocal(
        handle_scope.CloseAndEscape(i::Handle<i::String>::cast(value)));
}

bool debug::Script::IsWasm() const
{
    return Utils::OpenHandle(this)->type() == i::Script::TYPE_WASM;
}

bool debug::Script::IsModule() const
{
    return Utils::OpenHandle(this)->origin_options().IsModule();
}

namespace {
    int GetSmiValue(i::Handle<i::FixedArray> array, int index)
    {
        return i::Smi::ToInt(array->get(index));
    }

    bool CompareBreakLocation(const i::BreakLocation& loc1,
        const i::BreakLocation& loc2)
    {
        return loc1.position() < loc2.position();
    }
} // namespace

bool debug::Script::GetPossibleBreakpoints(
    const debug::Location& start, const debug::Location& end,
    bool restrict_to_function,
    std::vector<debug::BreakLocation>* locations) const
{
    CHECK(!start.IsEmpty());
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    if (script->type() == i::Script::TYPE_WASM && this->SourceMappingURL().IsEmpty()) {
        i::WasmModuleObject module_object = i::WasmModuleObject::cast(script->wasm_module_object());
        return module_object->GetPossibleBreakpoints(start, end, locations);
    }

    i::Script::InitLineEnds(script);
    CHECK(script->line_ends()->IsFixedArray());
    i::Isolate* isolate = script->GetIsolate();
    i::Handle<i::FixedArray> line_ends = i::Handle<i::FixedArray>::cast(i::handle(script->line_ends(), isolate));
    CHECK(line_ends->length());

    int start_offset = GetSourceOffset(start);
    int end_offset = end.IsEmpty()
        ? GetSmiValue(line_ends, line_ends->length() - 1) + 1
        : GetSourceOffset(end);
    if (start_offset >= end_offset)
        return true;

    std::vector<i::BreakLocation> v8_locations;
    if (!isolate->debug()->GetPossibleBreakpoints(
            script, start_offset, end_offset, restrict_to_function,
            &v8_locations)) {
        return false;
    }

    std::sort(v8_locations.begin(), v8_locations.end(), CompareBreakLocation);
    int current_line_end_index = 0;
    for (const auto& v8_location : v8_locations) {
        int offset = v8_location.position();
        while (offset > GetSmiValue(line_ends, current_line_end_index)) {
            ++current_line_end_index;
            CHECK(current_line_end_index < line_ends->length());
        }
        int line_offset = 0;

        if (current_line_end_index > 0) {
            line_offset = GetSmiValue(line_ends, current_line_end_index - 1) + 1;
        }
        locations->emplace_back(
            current_line_end_index + script->line_offset(),
            offset - line_offset + (current_line_end_index == 0 ? script->column_offset() : 0),
            v8_location.type());
    }
    return true;
}

int debug::Script::GetSourceOffset(const debug::Location& location) const
{
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    if (script->type() == i::Script::TYPE_WASM) {
        if (this->SourceMappingURL().IsEmpty()) {
            return i::WasmModuleObject::cast(script->wasm_module_object())
                       ->GetFunctionOffset(location.GetLineNumber())
                + location.GetColumnNumber();
        }
        DCHECK_EQ(0, location.GetLineNumber());
        return location.GetColumnNumber();
    }

    int line = std::max(location.GetLineNumber() - script->line_offset(), 0);
    int column = location.GetColumnNumber();
    if (line == 0) {
        column = std::max(0, column - script->column_offset());
    }

    i::Script::InitLineEnds(script);
    CHECK(script->line_ends()->IsFixedArray());
    i::Handle<i::FixedArray> line_ends = i::Handle<i::FixedArray>::cast(
        i::handle(script->line_ends(), script->GetIsolate()));
    CHECK(line_ends->length());
    if (line >= line_ends->length())
        return GetSmiValue(line_ends, line_ends->length() - 1);
    int line_offset = GetSmiValue(line_ends, line);
    if (line == 0)
        return std::min(column, line_offset);
    int prev_line_offset = GetSmiValue(line_ends, line - 1);
    return std::min(prev_line_offset + column + 1, line_offset);
}

v8::debug::Location debug::Script::GetSourceLocation(int offset) const
{
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    i::Script::PositionInfo info;
    i::Script::GetPositionInfo(script, offset, &info, i::Script::WITH_OFFSET);
    return debug::Location(info.line, info.column);
}

bool debug::Script::SetScriptSource(v8::Local<v8::String> newSource,
    bool preview,
    debug::LiveEditResult* result) const
{
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    i::Isolate* isolate = script->GetIsolate();
    return isolate->debug()->SetScriptSource(
        script, Utils::OpenHandle(*newSource), preview, result);
}

bool debug::Script::SetBreakpoint(v8::Local<v8::String> condition,
    debug::Location* location,
    debug::BreakpointId* id) const
{
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    i::Isolate* isolate = script->GetIsolate();
    int offset = GetSourceOffset(*location);
    if (!isolate->debug()->SetBreakPointForScript(
            script, Utils::OpenHandle(*condition), &offset, id)) {
        return false;
    }
    *location = GetSourceLocation(offset);
    return true;
}

void debug::RemoveBreakpoint(Isolate* v8_isolate, BreakpointId id)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    i::HandleScope handle_scope(isolate);
    isolate->debug()->RemoveBreakpoint(id);
}

v8::Platform* debug::GetCurrentPlatform()
{
    return i::V8::GetCurrentPlatform();
}

debug::WasmScript* debug::WasmScript::Cast(debug::Script* script)
{
    CHECK(script->IsWasm());
    return static_cast<WasmScript*>(script);
}

int debug::WasmScript::NumFunctions() const
{
    i::DisallowHeapAllocation no_gc;
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    DCHECK_EQ(i::Script::TYPE_WASM, script->type());
    i::WasmModuleObject module_object = i::WasmModuleObject::cast(script->wasm_module_object());
    const i::wasm::WasmModule* module = module_object->module();
    DCHECK_GE(i::kMaxInt, module->functions.size());
    return static_cast<int>(module->functions.size());
}

int debug::WasmScript::NumImportedFunctions() const
{
    i::DisallowHeapAllocation no_gc;
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    DCHECK_EQ(i::Script::TYPE_WASM, script->type());
    i::WasmModuleObject module_object = i::WasmModuleObject::cast(script->wasm_module_object());
    const i::wasm::WasmModule* module = module_object->module();
    DCHECK_GE(i::kMaxInt, module->num_imported_functions);
    return static_cast<int>(module->num_imported_functions);
}

std::pair<int, int> debug::WasmScript::GetFunctionRange(
    int function_index) const
{
    i::DisallowHeapAllocation no_gc;
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    DCHECK_EQ(i::Script::TYPE_WASM, script->type());
    i::WasmModuleObject module_object = i::WasmModuleObject::cast(script->wasm_module_object());
    const i::wasm::WasmModule* module = module_object->module();
    DCHECK_LE(0, function_index);
    DCHECK_GT(module->functions.size(), function_index);
    const i::wasm::WasmFunction& func = module->functions[function_index];
    DCHECK_GE(i::kMaxInt, func.code.offset());
    DCHECK_GE(i::kMaxInt, func.code.end_offset());
    return std::make_pair(static_cast<int>(func.code.offset()),
        static_cast<int>(func.code.end_offset()));
}

uint32_t debug::WasmScript::GetFunctionHash(int function_index)
{
    i::DisallowHeapAllocation no_gc;
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    DCHECK_EQ(i::Script::TYPE_WASM, script->type());
    i::WasmModuleObject module_object = i::WasmModuleObject::cast(script->wasm_module_object());
    const i::wasm::WasmModule* module = module_object->module();
    DCHECK_LE(0, function_index);
    DCHECK_GT(module->functions.size(), function_index);
    const i::wasm::WasmFunction& func = module->functions[function_index];
    i::wasm::ModuleWireBytes wire_bytes(
        module_object->native_module()->wire_bytes());
    i::Vector<const i::byte> function_bytes = wire_bytes.GetFunctionBytes(&func);
    // TODO(herhut): Maybe also take module, name and signature into account.
    return i::StringHasher::HashSequentialString(function_bytes.start(),
        function_bytes.length(), 0);
}

debug::WasmDisassembly debug::WasmScript::DisassembleFunction(
    int function_index) const
{
    i::DisallowHeapAllocation no_gc;
    i::Handle<i::Script> script = Utils::OpenHandle(this);
    DCHECK_EQ(i::Script::TYPE_WASM, script->type());
    i::WasmModuleObject module_object = i::WasmModuleObject::cast(script->wasm_module_object());
    return module_object->DisassembleFunction(function_index);
}

debug::Location::Location(int line_number, int column_number)
    : line_number_(line_number)
    , column_number_(column_number)
    , is_empty_(false)
{
}

debug::Location::Location()
    : line_number_(v8::Function::kLineOffsetNotFound)
    , column_number_(v8::Function::kLineOffsetNotFound)
    , is_empty_(true)
{
}

int debug::Location::GetLineNumber() const
{
    DCHECK(!IsEmpty());
    return line_number_;
}

int debug::Location::GetColumnNumber() const
{
    DCHECK(!IsEmpty());
    return column_number_;
}

bool debug::Location::IsEmpty() const { return is_empty_; }

void debug::GetLoadedScripts(v8::Isolate* v8_isolate,
    PersistentValueVector<debug::Script>& scripts)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    {
        i::DisallowHeapAllocation no_gc;
        i::Script::Iterator iterator(isolate);
        for (i::Script script = iterator.Next(); !script.is_null();
             script = iterator.Next()) {
            if (!script->IsUserJavaScript())
                continue;
            if (script->HasValidSource()) {
                i::HandleScope handle_scope(isolate);
                i::Handle<i::Script> script_handle(script, isolate);
                scripts.Append(ToApiHandle<Script>(script_handle));
            }
        }
    }
}

MaybeLocal<UnboundScript> debug::CompileInspectorScript(Isolate* v8_isolate,
    Local<String> source)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    PREPARE_FOR_DEBUG_INTERFACE_EXECUTION_WITH_ISOLATE(isolate, UnboundScript);
    i::Handle<i::String> str = Utils::OpenHandle(*source);
    i::Handle<i::SharedFunctionInfo> result;
    {
        ScriptOriginOptions origin_options;
        i::ScriptData* script_data = nullptr;
        i::MaybeHandle<i::SharedFunctionInfo> maybe_function_info = i::Compiler::GetSharedFunctionInfoForScript(
            isolate, str, i::Compiler::ScriptDetails(), origin_options, nullptr,
            script_data, ScriptCompiler::kNoCompileOptions,
            ScriptCompiler::kNoCacheBecauseInspector,
            i::FLAG_expose_inspector_scripts ? i::NOT_NATIVES_CODE
                                             : i::INSPECTOR_CODE);
        has_pending_exception = !maybe_function_info.ToHandle(&result);
        RETURN_ON_FAILED_EXECUTION(UnboundScript);
    }
    RETURN_ESCAPED(ToApiHandle<UnboundScript>(result));
}

void debug::SetDebugDelegate(Isolate* v8_isolate,
    debug::DebugDelegate* delegate)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    isolate->debug()->SetDebugDelegate(delegate);
}

void debug::SetAsyncEventDelegate(Isolate* v8_isolate,
    debug::AsyncEventDelegate* delegate)
{
    reinterpret_cast<i::Isolate*>(v8_isolate)->set_async_event_delegate(delegate);
}

void debug::ResetBlackboxedStateCache(Isolate* v8_isolate,
    v8::Local<debug::Script> script)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::DisallowHeapAllocation no_gc;
    i::SharedFunctionInfo::ScriptIterator iter(isolate,
        *Utils::OpenHandle(*script));
    for (i::SharedFunctionInfo info = iter.Next(); !info.is_null();
         info = iter.Next()) {
        if (info->HasDebugInfo()) {
            info->GetDebugInfo()->set_computed_debug_is_blackboxed(false);
        }
    }
}

int debug::EstimatedValueSize(Isolate* v8_isolate, v8::Local<v8::Value> value)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::Handle<i::Object> object = Utils::OpenHandle(*value);
    if (object->IsSmi())
        return i::kTaggedSize;
    CHECK(object->IsHeapObject());
    return i::Handle<i::HeapObject>::cast(object)->Size();
}

v8::MaybeLocal<v8::Array> v8::Object::PreviewEntries(bool* is_key_value)
{
    if (IsMap()) {
        *is_key_value = true;
        return Map::Cast(this)->AsArray();
    }
    if (IsSet()) {
        *is_key_value = false;
        return Set::Cast(this)->AsArray();
    }

    i::Handle<i::JSReceiver> object = Utils::OpenHandle(this);
    i::Isolate* isolate = object->GetIsolate();
    Isolate* v8_isolate = reinterpret_cast<Isolate*>(isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    if (object->IsJSWeakCollection()) {
        *is_key_value = object->IsJSWeakMap();
        return Utils::ToLocal(i::JSWeakCollection::GetEntries(
            i::Handle<i::JSWeakCollection>::cast(object), 0));
    }
    if (object->IsJSMapIterator()) {
        i::Handle<i::JSMapIterator> it = i::Handle<i::JSMapIterator>::cast(object);
        MapAsArrayKind const kind = static_cast<MapAsArrayKind>(it->map()->instance_type());
        *is_key_value = kind == MapAsArrayKind::kEntries;
        if (!it->HasMore())
            return v8::Array::New(v8_isolate);
        return Utils::ToLocal(
            MapAsArray(isolate, it->table(), i::Smi::ToInt(it->index()), kind));
    }
    if (object->IsJSSetIterator()) {
        i::Handle<i::JSSetIterator> it = i::Handle<i::JSSetIterator>::cast(object);
        SetAsArrayKind const kind = static_cast<SetAsArrayKind>(it->map()->instance_type());
        *is_key_value = kind == SetAsArrayKind::kEntries;
        if (!it->HasMore())
            return v8::Array::New(v8_isolate);
        return Utils::ToLocal(
            SetAsArray(isolate, it->table(), i::Smi::ToInt(it->index()), kind));
    }
    return v8::MaybeLocal<v8::Array>();
}

Local<Function> debug::GetBuiltin(Isolate* v8_isolate, Builtin builtin)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    i::HandleScope handle_scope(isolate);
    i::Builtins::Name builtin_id;
    switch (builtin) {
    case kStringToLowerCase:
        builtin_id = i::Builtins::kStringPrototypeToLocaleLowerCase;
        break;
    default:
        UNREACHABLE();
    }

    i::Handle<i::String> name = isolate->factory()->empty_string();
    i::NewFunctionArgs args = i::NewFunctionArgs::ForBuiltinWithoutPrototype(
        name, builtin_id, i::LanguageMode::kStrict);
    i::Handle<i::JSFunction> fun = isolate->factory()->NewFunction(args);

    fun->shared()->set_internal_formal_parameter_count(0);
    fun->shared()->set_length(0);
    return Utils::ToLocal(handle_scope.CloseAndEscape(fun));
}

void debug::SetConsoleDelegate(Isolate* v8_isolate, ConsoleDelegate* delegate)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    isolate->set_console_delegate(delegate);
}

debug::ConsoleCallArguments::ConsoleCallArguments(
    const v8::FunctionCallbackInfo<v8::Value>& info)
    : v8::FunctionCallbackInfo<v8::Value>(nullptr, info.values_, info.length_)
{
}

debug::ConsoleCallArguments::ConsoleCallArguments(
    internal::BuiltinArguments& args)
    : v8::FunctionCallbackInfo<v8::Value>(
        nullptr,
        // Drop the first argument (receiver, i.e. the "console" object).
        args.address_of_arg_at(args.length() > 1 ? 1 : 0),
        args.length() - 1)
{
}

int debug::GetStackFrameId(v8::Local<v8::StackFrame> frame)
{
    return Utils::OpenHandle(*frame)->id();
}

v8::Local<v8::StackTrace> debug::GetDetailedStackTrace(
    Isolate* v8_isolate, v8::Local<v8::Object> v8_error)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    i::Handle<i::JSReceiver> error = Utils::OpenHandle(*v8_error);
    if (!error->IsJSObject()) {
        return v8::Local<v8::StackTrace>();
    }
    i::Handle<i::FixedArray> stack_trace = isolate->GetDetailedStackTrace(i::Handle<i::JSObject>::cast(error));
    return Utils::StackTraceToLocal(stack_trace);
}

MaybeLocal<debug::Script> debug::GeneratorObject::Script()
{
    i::Handle<i::JSGeneratorObject> obj = Utils::OpenHandle(this);
    i::Object maybe_script = obj->function()->shared()->script();
    if (!maybe_script->IsScript())
        return MaybeLocal<debug::Script>();
    i::Handle<i::Script> script(i::Script::cast(maybe_script), obj->GetIsolate());
    return ToApiHandle<debug::Script>(script);
}

Local<Function> debug::GeneratorObject::Function()
{
    i::Handle<i::JSGeneratorObject> obj = Utils::OpenHandle(this);
    return Utils::ToLocal(handle(obj->function(), obj->GetIsolate()));
}

debug::Location debug::GeneratorObject::SuspendedLocation()
{
    i::Handle<i::JSGeneratorObject> obj = Utils::OpenHandle(this);
    CHECK(obj->is_suspended());
    i::Object maybe_script = obj->function()->shared()->script();
    if (!maybe_script->IsScript())
        return debug::Location();
    i::Isolate* isolate = obj->GetIsolate();
    i::Handle<i::Script> script(i::Script::cast(maybe_script), isolate);
    i::Script::PositionInfo info;
    i::SharedFunctionInfo::EnsureSourcePositionsAvailable(
        isolate, i::handle(obj->function()->shared(), isolate));
    i::Script::GetPositionInfo(script, obj->source_position(), &info,
        i::Script::WITH_OFFSET);
    return debug::Location(info.line, info.column);
}

bool debug::GeneratorObject::IsSuspended()
{
    return Utils::OpenHandle(this)->is_suspended();
}

v8::Local<debug::GeneratorObject> debug::GeneratorObject::Cast(
    v8::Local<v8::Value> value)
{
    CHECK(value->IsGeneratorObject());
    return ToApiHandle<debug::GeneratorObject>(Utils::OpenHandle(*value));
}

MaybeLocal<v8::Value> debug::EvaluateGlobal(v8::Isolate* isolate,
    v8::Local<v8::String> source,
    bool throw_on_side_effect)
{
    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
    PREPARE_FOR_DEBUG_INTERFACE_EXECUTION_WITH_ISOLATE(internal_isolate, Value);
    Local<Value> result;
    has_pending_exception = !ToLocal<Value>(
        i::DebugEvaluate::Global(internal_isolate, Utils::OpenHandle(*source),
            throw_on_side_effect),
        &result);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(result);
}

void debug::QueryObjects(v8::Local<v8::Context> v8_context,
    QueryObjectPredicate* predicate,
    PersistentValueVector<v8::Object>* objects)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_context->GetIsolate());
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(isolate);
    isolate->heap_profiler()->QueryObjects(Utils::OpenHandle(*v8_context),
        predicate, objects);
}

void debug::GlobalLexicalScopeNames(
    v8::Local<v8::Context> v8_context,
    v8::PersistentValueVector<v8::String>* names)
{
    i::Handle<i::Context> context = Utils::OpenHandle(*v8_context);
    i::Isolate* isolate = context->GetIsolate();
    i::Handle<i::ScriptContextTable> table(
        context->global_object()->native_context()->script_context_table(),
        isolate);
    for (int i = 0; i < table->used(); i++) {
        i::Handle<i::Context> context = i::ScriptContextTable::GetContext(isolate, table, i);
        DCHECK(context->IsScriptContext());
        i::Handle<i::ScopeInfo> scope_info(context->scope_info(), isolate);
        int local_count = scope_info->ContextLocalCount();
        for (int j = 0; j < local_count; ++j) {
            i::String name = scope_info->ContextLocalName(j);
            if (i::ScopeInfo::VariableIsSynthetic(name))
                continue;
            names->Append(Utils::ToLocal(handle(name, isolate)));
        }
    }
}

void debug::SetReturnValue(v8::Isolate* v8_isolate,
    v8::Local<v8::Value> value)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
    isolate->debug()->set_return_value(*Utils::OpenHandle(*value));
}

int64_t debug::GetNextRandomInt64(v8::Isolate* v8_isolate)
{
    return reinterpret_cast<i::Isolate*>(v8_isolate)
        ->random_number_generator()
        ->NextInt64();
}

int debug::GetDebuggingId(v8::Local<v8::Function> function)
{
    i::Handle<i::JSReceiver> callable = v8::Utils::OpenHandle(*function);
    if (!callable->IsJSFunction())
        return i::DebugInfo::kNoDebuggingId;
    i::Handle<i::JSFunction> func = i::Handle<i::JSFunction>::cast(callable);
    int id = func->GetIsolate()->debug()->GetFunctionDebuggingId(func);
    DCHECK_NE(i::DebugInfo::kNoDebuggingId, id);
    return id;
}

bool debug::SetFunctionBreakpoint(v8::Local<v8::Function> function,
    v8::Local<v8::String> condition,
    BreakpointId* id)
{
    i::Handle<i::JSReceiver> callable = Utils::OpenHandle(*function);
    if (!callable->IsJSFunction())
        return false;
    i::Handle<i::JSFunction> jsfunction = i::Handle<i::JSFunction>::cast(callable);
    i::Isolate* isolate = jsfunction->GetIsolate();
    i::Handle<i::String> condition_string = condition.IsEmpty() ? isolate->factory()->empty_string()
                                                                : Utils::OpenHandle(*condition);
    return isolate->debug()->SetBreakpointForFunction(jsfunction,
        condition_string, id);
}

debug::PostponeInterruptsScope::PostponeInterruptsScope(v8::Isolate* isolate)
    : scope_(
        new i::PostponeInterruptsScope(reinterpret_cast<i::Isolate*>(isolate),
            i::StackGuard::API_INTERRUPT))
{
}

debug::PostponeInterruptsScope::~PostponeInterruptsScope() = default;

Local<String> CpuProfileNode::GetFunctionName() const
{
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    i::Isolate* isolate = node->isolate();
    const i::CodeEntry* entry = node->entry();
    i::Handle<i::String> name = isolate->factory()->InternalizeUtf8String(entry->name());
    return ToApiHandle<String>(name);
}

int debug::Coverage::BlockData::StartOffset() const { return block_->start; }
int debug::Coverage::BlockData::EndOffset() const { return block_->end; }
uint32_t debug::Coverage::BlockData::Count() const { return block_->count; }

int debug::Coverage::FunctionData::StartOffset() const
{
    return function_->start;
}
int debug::Coverage::FunctionData::EndOffset() const { return function_->end; }
uint32_t debug::Coverage::FunctionData::Count() const
{
    return function_->count;
}

MaybeLocal<String> debug::Coverage::FunctionData::Name() const
{
    return ToApiHandle<String>(function_->name);
}

size_t debug::Coverage::FunctionData::BlockCount() const
{
    return function_->blocks.size();
}

bool debug::Coverage::FunctionData::HasBlockCoverage() const
{
    return function_->has_block_coverage;
}

debug::Coverage::BlockData debug::Coverage::FunctionData::GetBlockData(
    size_t i) const
{
    return BlockData(&function_->blocks.at(i), coverage_);
}

Local<debug::Script> debug::Coverage::ScriptData::GetScript() const
{
    return ToApiHandle<debug::Script>(script_->script);
}

size_t debug::Coverage::ScriptData::FunctionCount() const
{
    return script_->functions.size();
}

debug::Coverage::FunctionData debug::Coverage::ScriptData::GetFunctionData(
    size_t i) const
{
    return FunctionData(&script_->functions.at(i), coverage_);
}

debug::Coverage::ScriptData::ScriptData(size_t index,
    std::shared_ptr<i::Coverage> coverage)
    : script_(&coverage->at(index))
    , coverage_(std::move(coverage))
{
}

size_t debug::Coverage::ScriptCount() const { return coverage_->size(); }

debug::Coverage::ScriptData debug::Coverage::GetScriptData(size_t i) const
{
    return ScriptData(i, coverage_);
}

debug::Coverage debug::Coverage::CollectPrecise(Isolate* isolate)
{
    return Coverage(
        i::Coverage::CollectPrecise(reinterpret_cast<i::Isolate*>(isolate)));
}

debug::Coverage debug::Coverage::CollectBestEffort(Isolate* isolate)
{
    return Coverage(
        i::Coverage::CollectBestEffort(reinterpret_cast<i::Isolate*>(isolate)));
}

void debug::Coverage::SelectMode(Isolate* isolate, debug::CoverageMode mode)
{
    i::Coverage::SelectMode(reinterpret_cast<i::Isolate*>(isolate), mode);
}

int debug::TypeProfile::Entry::SourcePosition() const
{
    return entry_->position;
}

std::vector<MaybeLocal<String>> debug::TypeProfile::Entry::Types() const
{
    std::vector<MaybeLocal<String>> result;
    for (const internal::Handle<internal::String>& type : entry_->types) {
        result.emplace_back(ToApiHandle<String>(type));
    }
    return result;
}

debug::TypeProfile::ScriptData::ScriptData(
    size_t index, std::shared_ptr<i::TypeProfile> type_profile)
    : script_(&type_profile->at(index))
    , type_profile_(std::move(type_profile))
{
}

Local<debug::Script> debug::TypeProfile::ScriptData::GetScript() const
{
    return ToApiHandle<debug::Script>(script_->script);
}

std::vector<debug::TypeProfile::Entry> debug::TypeProfile::ScriptData::Entries()
    const
{
    std::vector<debug::TypeProfile::Entry> result;
    for (const internal::TypeProfileEntry& entry : script_->entries) {
        result.push_back(debug::TypeProfile::Entry(&entry, type_profile_));
    }
    return result;
}

debug::TypeProfile debug::TypeProfile::Collect(Isolate* isolate)
{
    return TypeProfile(
        i::TypeProfile::Collect(reinterpret_cast<i::Isolate*>(isolate)));
}

void debug::TypeProfile::SelectMode(Isolate* isolate,
    debug::TypeProfileMode mode)
{
    i::TypeProfile::SelectMode(reinterpret_cast<i::Isolate*>(isolate), mode);
}

size_t debug::TypeProfile::ScriptCount() const { return type_profile_->size(); }

debug::TypeProfile::ScriptData debug::TypeProfile::GetScriptData(
    size_t i) const
{
    return ScriptData(i, type_profile_);
}

v8::MaybeLocal<v8::Value> debug::WeakMap::Get(v8::Local<v8::Context> context,
    v8::Local<v8::Value> key)
{
    PREPARE_FOR_EXECUTION(context, WeakMap, Get, Value);
    auto self = Utils::OpenHandle(this);
    Local<Value> result;
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*key) };
    has_pending_exception = !ToLocal<Value>(i::Execution::Call(isolate, isolate->weakmap_get(), self,
                                                arraysize(argv), argv),
        &result);
    RETURN_ON_FAILED_EXECUTION(Value);
    RETURN_ESCAPED(result);
}

v8::MaybeLocal<debug::WeakMap> debug::WeakMap::Set(
    v8::Local<v8::Context> context, v8::Local<v8::Value> key,
    v8::Local<v8::Value> value)
{
    PREPARE_FOR_EXECUTION(context, WeakMap, Set, WeakMap);
    auto self = Utils::OpenHandle(this);
    i::Handle<i::Object> result;
    i::Handle<i::Object> argv[] = { Utils::OpenHandle(*key),
        Utils::OpenHandle(*value) };
    has_pending_exception = !i::Execution::Call(isolate, isolate->weakmap_set(),
        self, arraysize(argv), argv)
                                 .ToHandle(&result);
    RETURN_ON_FAILED_EXECUTION(WeakMap);
    RETURN_ESCAPED(Local<WeakMap>::Cast(Utils::ToLocal(result)));
}

Local<debug::WeakMap> debug::WeakMap::New(v8::Isolate* isolate)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    LOG_API(i_isolate, WeakMap, New);
    ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
    i::Handle<i::JSWeakMap> obj = i_isolate->factory()->NewJSWeakMap();
    return ToApiHandle<debug::WeakMap>(obj);
}

debug::WeakMap* debug::WeakMap::Cast(v8::Value* value)
{
    return static_cast<debug::WeakMap*>(value);
}

const char* CpuProfileNode::GetFunctionNameStr() const
{
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    return node->entry()->name();
}

int CpuProfileNode::GetScriptId() const
{
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    const i::CodeEntry* entry = node->entry();
    return entry->script_id();
}

Local<String> CpuProfileNode::GetScriptResourceName() const
{
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    i::Isolate* isolate = node->isolate();
    return ToApiHandle<String>(isolate->factory()->InternalizeUtf8String(
        node->entry()->resource_name()));
}

const char* CpuProfileNode::GetScriptResourceNameStr() const
{
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    return node->entry()->resource_name();
}

bool CpuProfileNode::IsScriptSharedCrossOrigin() const
{
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    return node->entry()->is_shared_cross_origin();
}

int CpuProfileNode::GetLineNumber() const
{
    return reinterpret_cast<const i::ProfileNode*>(this)->line_number();
}

int CpuProfileNode::GetColumnNumber() const
{
    return reinterpret_cast<const i::ProfileNode*>(this)->entry()->column_number();
}

unsigned int CpuProfileNode::GetHitLineCount() const
{
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    return node->GetHitLineCount();
}

bool CpuProfileNode::GetLineTicks(LineTick* entries,
    unsigned int length) const
{
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    return node->GetLineTicks(entries, length);
}

const char* CpuProfileNode::GetBailoutReason() const
{
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    return node->entry()->bailout_reason();
}

unsigned CpuProfileNode::GetHitCount() const
{
    return reinterpret_cast<const i::ProfileNode*>(this)->self_ticks();
}

unsigned CpuProfileNode::GetCallUid() const
{
    return reinterpret_cast<const i::ProfileNode*>(this)->function_id();
}

unsigned CpuProfileNode::GetNodeId() const
{
    return reinterpret_cast<const i::ProfileNode*>(this)->id();
}

CpuProfileNode::SourceType CpuProfileNode::GetSourceType() const
{
    return reinterpret_cast<const i::ProfileNode*>(this)->source_type();
}

int CpuProfileNode::GetChildrenCount() const
{
    return static_cast<int>(
        reinterpret_cast<const i::ProfileNode*>(this)->children()->size());
}

const CpuProfileNode* CpuProfileNode::GetChild(int index) const
{
    const i::ProfileNode* child = reinterpret_cast<const i::ProfileNode*>(this)->children()->at(index);
    return reinterpret_cast<const CpuProfileNode*>(child);
}

const CpuProfileNode* CpuProfileNode::GetParent() const
{
    const i::ProfileNode* parent = reinterpret_cast<const i::ProfileNode*>(this)->parent();
    return reinterpret_cast<const CpuProfileNode*>(parent);
}

const std::vector<CpuProfileDeoptInfo>& CpuProfileNode::GetDeoptInfos() const
{
    const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
    return node->deopt_infos();
}

void CpuProfile::Delete()
{
    i::CpuProfile* profile = reinterpret_cast<i::CpuProfile*>(this);
    i::CpuProfiler* profiler = profile->cpu_profiler();
    DCHECK_NOT_NULL(profiler);
    profiler->DeleteProfile(profile);
}

Local<String> CpuProfile::GetTitle() const
{
    const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
    i::Isolate* isolate = profile->top_down()->isolate();
    return ToApiHandle<String>(isolate->factory()->InternalizeUtf8String(
        profile->title()));
}

const CpuProfileNode* CpuProfile::GetTopDownRoot() const
{
    const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
    return reinterpret_cast<const CpuProfileNode*>(profile->top_down()->root());
}

const CpuProfileNode* CpuProfile::GetSample(int index) const
{
    const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
    return reinterpret_cast<const CpuProfileNode*>(profile->sample(index).node);
}

int64_t CpuProfile::GetSampleTimestamp(int index) const
{
    const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
    return (profile->sample(index).timestamp - base::TimeTicks())
        .InMicroseconds();
}

int64_t CpuProfile::GetStartTime() const
{
    const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
    return (profile->start_time() - base::TimeTicks()).InMicroseconds();
}

int64_t CpuProfile::GetEndTime() const
{
    const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
    return (profile->end_time() - base::TimeTicks()).InMicroseconds();
}

int CpuProfile::GetSamplesCount() const
{
    return reinterpret_cast<const i::CpuProfile*>(this)->samples_count();
}

CpuProfiler* CpuProfiler::New(Isolate* isolate)
{
    return reinterpret_cast<CpuProfiler*>(
        new i::CpuProfiler(reinterpret_cast<i::Isolate*>(isolate)));
}

void CpuProfiler::Dispose() { delete reinterpret_cast<i::CpuProfiler*>(this); }

// static
void CpuProfiler::CollectSample(Isolate* isolate)
{
    i::CpuProfiler::CollectSample(reinterpret_cast<i::Isolate*>(isolate));
}

void CpuProfiler::SetSamplingInterval(int us)
{
    DCHECK_GE(us, 0);
    return reinterpret_cast<i::CpuProfiler*>(this)->set_sampling_interval(
        base::TimeDelta::FromMicroseconds(us));
}

void CpuProfiler::SetUsePreciseSampling(bool use_precise_sampling)
{
    reinterpret_cast<i::CpuProfiler*>(this)->set_use_precise_sampling(
        use_precise_sampling);
}

void CpuProfiler::CollectSample()
{
    reinterpret_cast<i::CpuProfiler*>(this)->CollectSample();
}

void CpuProfiler::StartProfiling(Local<String> title, bool record_samples)
{
    reinterpret_cast<i::CpuProfiler*>(this)->StartProfiling(
        *Utils::OpenHandle(*title), record_samples, kLeafNodeLineNumbers);
}

void CpuProfiler::StartProfiling(Local<String> title, CpuProfilingMode mode,
    bool record_samples)
{
    reinterpret_cast<i::CpuProfiler*>(this)->StartProfiling(
        *Utils::OpenHandle(*title), record_samples, mode);
}

CpuProfile* CpuProfiler::StopProfiling(Local<String> title)
{
    return reinterpret_cast<CpuProfile*>(
        reinterpret_cast<i::CpuProfiler*>(this)->StopProfiling(
            *Utils::OpenHandle(*title)));
}

void CpuProfiler::SetIdle(bool is_idle)
{
    i::CpuProfiler* profiler = reinterpret_cast<i::CpuProfiler*>(this);
    i::Isolate* isolate = profiler->isolate();
    isolate->SetIdle(is_idle);
}

void CpuProfiler::UseDetailedSourcePositionsForProfiling(Isolate* isolate)
{
    reinterpret_cast<i::Isolate*>(isolate)
        ->set_detailed_source_positions_for_profiling(true);
}

uintptr_t CodeEvent::GetCodeStartAddress()
{
    return reinterpret_cast<i::CodeEvent*>(this)->code_start_address;
}

size_t CodeEvent::GetCodeSize()
{
    return reinterpret_cast<i::CodeEvent*>(this)->code_size;
}

Local<String> CodeEvent::GetFunctionName()
{
    return ToApiHandle<String>(
        reinterpret_cast<i::CodeEvent*>(this)->function_name);
}

Local<String> CodeEvent::GetScriptName()
{
    return ToApiHandle<String>(
        reinterpret_cast<i::CodeEvent*>(this)->script_name);
}

int CodeEvent::GetScriptLine()
{
    return reinterpret_cast<i::CodeEvent*>(this)->script_line;
}

int CodeEvent::GetScriptColumn()
{
    return reinterpret_cast<i::CodeEvent*>(this)->script_column;
}

CodeEventType CodeEvent::GetCodeType()
{
    return reinterpret_cast<i::CodeEvent*>(this)->code_type;
}

const char* CodeEvent::GetComment()
{
    return reinterpret_cast<i::CodeEvent*>(this)->comment;
}

const char* CodeEvent::GetCodeEventTypeName(CodeEventType code_event_type)
{
    switch (code_event_type) {
    case kUnknownType:
        return "Unknown";
#define V(Name)         \
    case k##Name##Type: \
        return #Name;
        CODE_EVENTS_LIST(V)
#undef V
    }
    // The execution should never pass here
    UNREACHABLE();
    // NOTE(mmarchini): Workaround to fix a compiler failure on GCC 4.9
    return "Unknown";
}

CodeEventHandler::CodeEventHandler(Isolate* isolate)
{
    internal_listener_ = new i::ExternalCodeEventListener(reinterpret_cast<i::Isolate*>(isolate));
}

CodeEventHandler::~CodeEventHandler()
{
    delete reinterpret_cast<i::ExternalCodeEventListener*>(internal_listener_);
}

void CodeEventHandler::Enable()
{
    reinterpret_cast<i::ExternalCodeEventListener*>(internal_listener_)
        ->StartListening(this);
}

void CodeEventHandler::Disable()
{
    reinterpret_cast<i::ExternalCodeEventListener*>(internal_listener_)
        ->StopListening();
}

static i::HeapGraphEdge* ToInternal(const HeapGraphEdge* edge)
{
    return const_cast<i::HeapGraphEdge*>(
        reinterpret_cast<const i::HeapGraphEdge*>(edge));
}

HeapGraphEdge::Type HeapGraphEdge::GetType() const
{
    return static_cast<HeapGraphEdge::Type>(ToInternal(this)->type());
}

Local<Value> HeapGraphEdge::GetName() const
{
    i::HeapGraphEdge* edge = ToInternal(this);
    i::Isolate* isolate = edge->isolate();
    switch (edge->type()) {
    case i::HeapGraphEdge::kContextVariable:
    case i::HeapGraphEdge::kInternal:
    case i::HeapGraphEdge::kProperty:
    case i::HeapGraphEdge::kShortcut:
    case i::HeapGraphEdge::kWeak:
        return ToApiHandle<String>(
            isolate->factory()->InternalizeUtf8String(edge->name()));
    case i::HeapGraphEdge::kElement:
    case i::HeapGraphEdge::kHidden:
        return ToApiHandle<Number>(
            isolate->factory()->NewNumberFromInt(edge->index()));
    default:
        UNREACHABLE();
    }
    return v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
}

const HeapGraphNode* HeapGraphEdge::GetFromNode() const
{
    const i::HeapEntry* from = ToInternal(this)->from();
    return reinterpret_cast<const HeapGraphNode*>(from);
}

const HeapGraphNode* HeapGraphEdge::GetToNode() const
{
    const i::HeapEntry* to = ToInternal(this)->to();
    return reinterpret_cast<const HeapGraphNode*>(to);
}

static i::HeapEntry* ToInternal(const HeapGraphNode* entry)
{
    return const_cast<i::HeapEntry*>(
        reinterpret_cast<const i::HeapEntry*>(entry));
}

HeapGraphNode::Type HeapGraphNode::GetType() const
{
    return static_cast<HeapGraphNode::Type>(ToInternal(this)->type());
}

Local<String> HeapGraphNode::GetName() const
{
    i::Isolate* isolate = ToInternal(this)->isolate();
    return ToApiHandle<String>(
        isolate->factory()->InternalizeUtf8String(ToInternal(this)->name()));
}

SnapshotObjectId HeapGraphNode::GetId() const
{
    return ToInternal(this)->id();
}

size_t HeapGraphNode::GetShallowSize() const
{
    return ToInternal(this)->self_size();
}

int HeapGraphNode::GetChildrenCount() const
{
    return ToInternal(this)->children_count();
}

const HeapGraphEdge* HeapGraphNode::GetChild(int index) const
{
    return reinterpret_cast<const HeapGraphEdge*>(ToInternal(this)->child(index));
}

static i::HeapSnapshot* ToInternal(const HeapSnapshot* snapshot)
{
    return const_cast<i::HeapSnapshot*>(
        reinterpret_cast<const i::HeapSnapshot*>(snapshot));
}

void HeapSnapshot::Delete()
{
    i::Isolate* isolate = ToInternal(this)->profiler()->isolate();
    if (isolate->heap_profiler()->GetSnapshotsCount() > 1) {
        ToInternal(this)->Delete();
    } else {
        // If this is the last snapshot, clean up all accessory data as well.
        isolate->heap_profiler()->DeleteAllSnapshots();
    }
}

const HeapGraphNode* HeapSnapshot::GetRoot() const
{
    return reinterpret_cast<const HeapGraphNode*>(ToInternal(this)->root());
}

const HeapGraphNode* HeapSnapshot::GetNodeById(SnapshotObjectId id) const
{
    return reinterpret_cast<const HeapGraphNode*>(
        ToInternal(this)->GetEntryById(id));
}

int HeapSnapshot::GetNodesCount() const
{
    return static_cast<int>(ToInternal(this)->entries().size());
}

const HeapGraphNode* HeapSnapshot::GetNode(int index) const
{
    return reinterpret_cast<const HeapGraphNode*>(
        &ToInternal(this)->entries().at(index));
}

SnapshotObjectId HeapSnapshot::GetMaxSnapshotJSObjectId() const
{
    return ToInternal(this)->max_snapshot_js_object_id();
}

void HeapSnapshot::Serialize(OutputStream* stream,
    HeapSnapshot::SerializationFormat format) const
{
    Utils::ApiCheck(format == kJSON,
        "v8::HeapSnapshot::Serialize",
        "Unknown serialization format");
    Utils::ApiCheck(stream->GetChunkSize() > 0,
        "v8::HeapSnapshot::Serialize",
        "Invalid stream chunk size");
    i::HeapSnapshotJSONSerializer serializer(ToInternal(this));
    serializer.Serialize(stream);
}

// static
STATIC_CONST_MEMBER_DEFINITION const SnapshotObjectId
    HeapProfiler::kUnknownObjectId;

int HeapProfiler::GetSnapshotCount()
{
    return reinterpret_cast<i::HeapProfiler*>(this)->GetSnapshotsCount();
}

const HeapSnapshot* HeapProfiler::GetHeapSnapshot(int index)
{
    return reinterpret_cast<const HeapSnapshot*>(
        reinterpret_cast<i::HeapProfiler*>(this)->GetSnapshot(index));
}

SnapshotObjectId HeapProfiler::GetObjectId(Local<Value> value)
{
    i::Handle<i::Object> obj = Utils::OpenHandle(*value);
    return reinterpret_cast<i::HeapProfiler*>(this)->GetSnapshotObjectId(obj);
}

Local<Value> HeapProfiler::FindObjectById(SnapshotObjectId id)
{
    i::Handle<i::Object> obj = reinterpret_cast<i::HeapProfiler*>(this)->FindHeapObjectById(id);
    if (obj.is_null())
        return Local<Value>();
    return Utils::ToLocal(obj);
}

void HeapProfiler::ClearObjectIds()
{
    reinterpret_cast<i::HeapProfiler*>(this)->ClearHeapObjectMap();
}

const HeapSnapshot* HeapProfiler::TakeHeapSnapshot(
    ActivityControl* control, ObjectNameResolver* resolver)
{
    return reinterpret_cast<const HeapSnapshot*>(
        reinterpret_cast<i::HeapProfiler*>(this)
            ->TakeSnapshot(control, resolver));
}

void HeapProfiler::StartTrackingHeapObjects(bool track_allocations)
{
    reinterpret_cast<i::HeapProfiler*>(this)->StartHeapObjectsTracking(
        track_allocations);
}

void HeapProfiler::StopTrackingHeapObjects()
{
    reinterpret_cast<i::HeapProfiler*>(this)->StopHeapObjectsTracking();
}

SnapshotObjectId HeapProfiler::GetHeapStats(OutputStream* stream,
    int64_t* timestamp_us)
{
    i::HeapProfiler* heap_profiler = reinterpret_cast<i::HeapProfiler*>(this);
    return heap_profiler->PushHeapObjectsStats(stream, timestamp_us);
}

bool HeapProfiler::StartSamplingHeapProfiler(uint64_t sample_interval,
    int stack_depth,
    SamplingFlags flags)
{
    return reinterpret_cast<i::HeapProfiler*>(this)->StartSamplingHeapProfiler(
        sample_interval, stack_depth, flags);
}

void HeapProfiler::StopSamplingHeapProfiler()
{
    reinterpret_cast<i::HeapProfiler*>(this)->StopSamplingHeapProfiler();
}

AllocationProfile* HeapProfiler::GetAllocationProfile()
{
    return reinterpret_cast<i::HeapProfiler*>(this)->GetAllocationProfile();
}

void HeapProfiler::DeleteAllHeapSnapshots()
{
    reinterpret_cast<i::HeapProfiler*>(this)->DeleteAllSnapshots();
}

void HeapProfiler::AddBuildEmbedderGraphCallback(
    BuildEmbedderGraphCallback callback, void* data)
{
    reinterpret_cast<i::HeapProfiler*>(this)->AddBuildEmbedderGraphCallback(
        callback, data);
}

void HeapProfiler::RemoveBuildEmbedderGraphCallback(
    BuildEmbedderGraphCallback callback, void* data)
{
    reinterpret_cast<i::HeapProfiler*>(this)->RemoveBuildEmbedderGraphCallback(
        callback, data);
}

v8::Testing::StressType internal::Testing::stress_type_ = v8::Testing::kStressTypeOpt;

void Testing::SetStressRunType(Testing::StressType type)
{
    internal::Testing::set_stress_type(type);
}

int Testing::GetStressRuns()
{
    if (internal::FLAG_stress_runs != 0)
        return internal::FLAG_stress_runs;
#ifdef DEBUG
    // In debug mode the code runs much slower so stressing will only make two
    // runs.
    return 2;
#else
    return 5;
#endif
}

static void SetFlagsFromString(const char* flags)
{
    V8::SetFlagsFromString(flags, i::StrLength(flags));
}

void Testing::PrepareStressRun(int run)
{
    static const char* kLazyOptimizations = "--prepare-always-opt "
                                            "--max-inlined-bytecode-size=999999 "
                                            "--max-inlined-bytecode-size-cumulative=999999 "
                                            "--noalways-opt";
    static const char* kForcedOptimizations = "--always-opt";

    // If deoptimization stressed turn on frequent deoptimization. If no value
    // is spefified through --deopt-every-n-times use a default default value.
    static const char* kDeoptEvery13Times = "--deopt-every-n-times=13";
    if (internal::Testing::stress_type() == Testing::kStressTypeDeopt && internal::FLAG_deopt_every_n_times == 0) {
        SetFlagsFromString(kDeoptEvery13Times);
    }

#ifdef DEBUG
    // As stressing in debug mode only make two runs skip the deopt stressing
    // here.
    if (run == GetStressRuns() - 1) {
        SetFlagsFromString(kForcedOptimizations);
    } else {
        SetFlagsFromString(kLazyOptimizations);
    }
#else
    if (run == GetStressRuns() - 1) {
        SetFlagsFromString(kForcedOptimizations);
    } else if (run != GetStressRuns() - 2) {
        SetFlagsFromString(kLazyOptimizations);
    }
#endif
}

void Testing::DeoptimizeAll(Isolate* isolate)
{
    i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
    i::HandleScope scope(i_isolate);
    i::Deoptimizer::DeoptimizeAll(i_isolate);
}

void EmbedderHeapTracer::FinalizeTracing()
{
    if (isolate_) {
        i::Isolate* isolate = reinterpret_cast<i::Isolate*>(isolate_);
        if (isolate->heap()->incremental_marking()->IsMarking()) {
            isolate->heap()->FinalizeIncrementalMarkingAtomically(
                i::GarbageCollectionReason::kExternalFinalize);
        }
    }
}

void EmbedderHeapTracer::GarbageCollectionForTesting(
    EmbedderStackState stack_state)
{
    CHECK(isolate_);
    CHECK(i::FLAG_expose_gc);
    i::Heap* const heap = reinterpret_cast<i::Isolate*>(isolate_)->heap();
    heap->SetEmbedderStackStateForNextFinalizaton(stack_state);
    heap->PreciseCollectAllGarbage(i::Heap::kNoGCFlags,
        i::GarbageCollectionReason::kTesting,
        kGCCallbackFlagForced);
}

void EmbedderHeapTracer::RegisterEmbedderReference(
    const TracedGlobal<v8::Value>& ref)
{
    if (ref.IsEmpty())
        return;

    i::Heap* const heap = reinterpret_cast<i::Isolate*>(isolate_)->heap();
    heap->RegisterExternallyReferencedObject(
        reinterpret_cast<i::Address*>(ref.val_));
}

void EmbedderHeapTracer::IterateTracedGlobalHandles(
    TracedGlobalHandleVisitor* visitor)
{
    i::Isolate* isolate = reinterpret_cast<i::Isolate*>(isolate_);
    i::DisallowHeapAllocation no_allocation;
    isolate->global_handles()->IterateTracedNodes(visitor);
}

namespace internal {

    const size_t HandleScopeImplementer::kEnteredContextsOffset = offsetof(HandleScopeImplementer, entered_contexts_);
    const size_t HandleScopeImplementer::kIsMicrotaskContextOffset = offsetof(HandleScopeImplementer, is_microtask_context_);

    void HandleScopeImplementer::FreeThreadResources()
    {
        Free();
    }

    char* HandleScopeImplementer::ArchiveThread(char* storage)
    {
        HandleScopeData* current = isolate_->handle_scope_data();
        handle_scope_data_ = *current;
        MemCopy(storage, this, sizeof(*this));

        ResetAfterArchive();
        current->Initialize();

        return storage + ArchiveSpacePerThread();
    }

    int HandleScopeImplementer::ArchiveSpacePerThread()
    {
        return sizeof(HandleScopeImplementer);
    }

    char* HandleScopeImplementer::RestoreThread(char* storage)
    {
        MemCopy(this, storage, sizeof(*this));
        *isolate_->handle_scope_data() = handle_scope_data_;
        return storage + ArchiveSpacePerThread();
    }

    void HandleScopeImplementer::IterateThis(RootVisitor* v)
    {
#ifdef DEBUG
        bool found_block_before_deferred = false;
#endif
        // Iterate over all handles in the blocks except for the last.
        for (int i = static_cast<int>(blocks()->size()) - 2; i >= 0; --i) {
            Address* block = blocks()->at(i);
            // Cast possibly-unrelated pointers to plain Address before comparing them
            // to avoid undefined behavior.
            if (last_handle_before_deferred_block_ != nullptr && (reinterpret_cast<Address>(last_handle_before_deferred_block_) <= reinterpret_cast<Address>(&block[kHandleBlockSize])) && (reinterpret_cast<Address>(last_handle_before_deferred_block_) >= reinterpret_cast<Address>(block))) {
                v->VisitRootPointers(Root::kHandleScope, nullptr, FullObjectSlot(block),
                    FullObjectSlot(last_handle_before_deferred_block_));
                DCHECK(!found_block_before_deferred);
#ifdef DEBUG
                found_block_before_deferred = true;
#endif
            } else {
                v->VisitRootPointers(Root::kHandleScope, nullptr, FullObjectSlot(block),
                    FullObjectSlot(&block[kHandleBlockSize]));
            }
        }

        DCHECK(last_handle_before_deferred_block_ == nullptr || found_block_before_deferred);

        // Iterate over live handles in the last block (if any).
        if (!blocks()->empty()) {
            v->VisitRootPointers(Root::kHandleScope, nullptr,
                FullObjectSlot(blocks()->back()),
                FullObjectSlot(handle_scope_data_.next));
        }

        DetachableVector<Context>* context_lists[2] = { &saved_contexts_,
            &entered_contexts_ };
        for (unsigned i = 0; i < arraysize(context_lists); i++) {
            context_lists[i]->shrink_to_fit();
            if (context_lists[i]->empty())
                continue;
            FullObjectSlot start(&context_lists[i]->front());
            v->VisitRootPointers(Root::kHandleScope, nullptr, start,
                start + static_cast<int>(context_lists[i]->size()));
        }
    }

    void HandleScopeImplementer::Iterate(RootVisitor* v)
    {
        HandleScopeData* current = isolate_->handle_scope_data();
        handle_scope_data_ = *current;
        IterateThis(v);
    }

    char* HandleScopeImplementer::Iterate(RootVisitor* v, char* storage)
    {
        HandleScopeImplementer* scope_implementer = reinterpret_cast<HandleScopeImplementer*>(storage);
        scope_implementer->IterateThis(v);
        return storage + ArchiveSpacePerThread();
    }

    DeferredHandles* HandleScopeImplementer::Detach(Address* prev_limit)
    {
        DeferredHandles* deferred = new DeferredHandles(isolate()->handle_scope_data()->next, isolate());

        while (!blocks_.empty()) {
            Address* block_start = blocks_.back();
            Address* block_limit = &block_start[kHandleBlockSize];
            // We should not need to check for SealHandleScope here. Assert this.
            DCHECK(prev_limit == block_limit || !(block_start <= prev_limit && prev_limit <= block_limit));
            if (prev_limit == block_limit)
                break;
            deferred->blocks_.push_back(blocks_.back());
            blocks_.pop_back();
        }

        // deferred->blocks_ now contains the blocks installed on the
        // HandleScope stack since BeginDeferredScope was called, but in
        // reverse order.

        DCHECK(prev_limit == nullptr || !blocks_.empty());

        DCHECK(!blocks_.empty() && prev_limit != nullptr);
        DCHECK_NOT_NULL(last_handle_before_deferred_block_);
        last_handle_before_deferred_block_ = nullptr;
        return deferred;
    }

    void HandleScopeImplementer::BeginDeferredScope()
    {
        DCHECK_NULL(last_handle_before_deferred_block_);
        last_handle_before_deferred_block_ = isolate()->handle_scope_data()->next;
    }

    DeferredHandles::~DeferredHandles()
    {
        isolate_->UnlinkDeferredHandles(this);

        for (size_t i = 0; i < blocks_.size(); i++) {
#ifdef ENABLE_HANDLE_ZAPPING
            HandleScope::ZapRange(blocks_[i], &blocks_[i][kHandleBlockSize]);
#endif
            isolate_->handle_scope_implementer()->ReturnBlock(blocks_[i]);
        }
    }

    void DeferredHandles::Iterate(RootVisitor* v)
    {
        DCHECK(!blocks_.empty());

        // Comparing pointers that do not point into the same array is undefined
        // behavior, which means if we didn't cast everything to plain Address
        // before comparing, the compiler would be allowed to assume that all
        // comparisons evaluate to true and drop the entire check.
        DCHECK((reinterpret_cast<Address>(first_block_limit_) >= reinterpret_cast<Address>(blocks_.front())) && (reinterpret_cast<Address>(first_block_limit_) <= reinterpret_cast<Address>(&(blocks_.front())[kHandleBlockSize])));

        v->VisitRootPointers(Root::kHandleScope, nullptr,
            FullObjectSlot(blocks_.front()),
            FullObjectSlot(first_block_limit_));

        for (size_t i = 1; i < blocks_.size(); i++) {
            v->VisitRootPointers(Root::kHandleScope, nullptr,
                FullObjectSlot(blocks_[i]),
                FullObjectSlot(&blocks_[i][kHandleBlockSize]));
        }
    }

    void InvokeAccessorGetterCallback(
        v8::Local<v8::Name> property,
        const v8::PropertyCallbackInfo<v8::Value>& info,
        v8::AccessorNameGetterCallback getter)
    {
        // Leaving JavaScript.
        Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
        RuntimeCallTimerScope timer(isolate,
            RuntimeCallCounterId::kAccessorGetterCallback);
        Address getter_address = reinterpret_cast<Address>(getter);
        VMState<EXTERNAL> state(isolate);
        ExternalCallbackScope call_scope(isolate, getter_address);
        getter(property, info);
    }

    void InvokeFunctionCallback(const v8::FunctionCallbackInfo<v8::Value>& info,
        v8::FunctionCallback callback)
    {
        Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
        RuntimeCallTimerScope timer(isolate,
            RuntimeCallCounterId::kInvokeFunctionCallback);
        Address callback_address = reinterpret_cast<Address>(callback);
        VMState<EXTERNAL> state(isolate);
        ExternalCallbackScope call_scope(isolate, callback_address);
        callback(info);
    }

    // Undefine macros for jumbo build.
    // #undef LOG_API
    // #undef ENTER_V8_DO_NOT_USE
    // #undef ENTER_V8_HELPER_DO_NOT_USE
    // #undef PREPARE_FOR_DEBUG_INTERFACE_EXECUTION_WITH_ISOLATE
    // #undef PREPARE_FOR_EXECUTION_WITH_CONTEXT
    // #undef PREPARE_FOR_EXECUTION
    // #undef ENTER_V8
    // #undef ENTER_V8_NO_SCRIPT
    // #undef ENTER_V8_NO_SCRIPT_NO_EXCEPTION
    // #undef ENTER_V8_FOR_NEW_CONTEXT
    // #undef EXCEPTION_BAILOUT_CHECK_SCOPED_DO_NOT_USE
    // #undef RETURN_ON_FAILED_EXECUTION
    // #undef RETURN_ON_FAILED_EXECUTION_PRIMITIVE
    // #undef RETURN_TO_LOCAL_UNCHECKED
    // #undef RETURN_ESCAPED
    // #undef SET_FIELD_WRAPPED
    // #undef NEW_STRING
    // #undef CALLBACK_SETTER

} // namespace internal

CpuProfiler* Isolate::GetCpuProfiler()
{
    //   i::CpuProfiler* cpu_profiler =
    //     reinterpret_cast<i::Isolate*>(this)->cpu_profiler();
    //   return reinterpret_cast<CpuProfiler*>(cpu_profiler);
    base::OS::DebugBreak();
    return nullptr;
}

Local<Array> StackTrace::AsArray()
{
    // return Utils::ToLocal(Utils::OpenHandle(this));
    base::OS::DebugBreak();
    return Local<Array>();
}

void NativeWeakMap::Set(Local<Value> v8_key, Local<Value> v8_value)
{
    base::OS::DebugBreak();
}

Local<Value> NativeWeakMap::Get(Local<Value> v8_key)
{
    base::OS::DebugBreak();
    return Local<Value>();
}

Local<NativeWeakMap> NativeWeakMap::New(Isolate* v8_isolate)
{
    base::OS::DebugBreak();
    return Local<NativeWeakMap>();
}

void Debug::SetLiveEditEnabled(Isolate* isolate, bool enable) { }

MaybeLocal<Value> Debug::Call(Local<Context> context,
    v8::Local<v8::Function> fun,
    v8::Local<v8::Value> data)
{
    base::OS::DebugBreak();
    return MaybeLocal<Value>();
}

bool Debug::CheckDebugBreak(Isolate* isolate)
{
    base::OS::DebugBreak();
    return false;
}

void Debug::CancelDebugBreak(Isolate* isolate) { base::OS::DebugBreak(); }

void Debug::DebugBreak(Isolate* isolate) { base::OS::DebugBreak(); }

bool Debug::SetDebugEventListener(Isolate* isolate, EventCallback that,
    Local<Value> data)
{
    return true;
}

Local<Context> Debug::GetDebugContext(Isolate* isolate)
{
    return Local<Context>();
}

String::Utf8Value::Utf8Value(v8::Local<v8::Value> obj)
    : Utf8Value(Isolate::GetCurrent(), obj)
{
}

int String::Write(uint16_t* buffer, int start, int length, int options) const
{
    Isolate* isolate = Isolate::GetCurrent();
    return Write(isolate, buffer, start, length, options);
}

int String::WriteUtf8(char* buffer, int length, int* nchars_ref,
    int options) const
{
    Isolate* isolate = Isolate::GetCurrent();
    return WriteUtf8(isolate, buffer, length, nchars_ref, options);
}

int String::Utf8Length() const
{
    Isolate* isolate = Isolate::GetCurrent();
    return Utf8Length(isolate);
}

int String::WriteOneByte(uint8_t* buffer, int start, int length,
    int options) const
{
    Isolate* isolate = Isolate::GetCurrent();
    return WriteOneByte(isolate, buffer, start, length, options);
}

void Isolate::SetAutorunMicrotasks(bool autorun)
{
    SetMicrotasksPolicy(autorun ? MicrotasksPolicy::kAuto
                                : MicrotasksPolicy::kExplicit);
}

const ScriptCompiler::CachedData*
ScriptCompiler::StreamedSource::GetCachedData() const
{
    // return impl_->cached_data.get();
    base::OS::DebugBreak();
    return nullptr;
}

void Isolate::SetReferenceFromGroup(UniqueId id, internal::Object** object)
{
    //   i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(this);
    //   internal_isolate->global_handles()->SetReferenceFromGroup(id, i::Handle<i::Object>(object).location());
}

// void Isolate::AddCallCompletedCallback(void(__cdecl*)(void)) {
// }
//
// void Isolate::RemoveCallCompletedCallback(void(__cdecl*)(void)) {
// }

bool Isolate::WillAutorunMicrotasks(void) const
{
    return false;
}

int32_t Value::Int32Value() const
{
    auto obj = Utils::OpenHandle(this);
    if (obj->IsNumber())
        return NumberToInt32(*obj);

    auto context = reinterpret_cast<v8::Isolate*>(Isolate::GetCurrent())->GetCurrentContext();
    return Int32Value((context)).FromMaybe(0);
}

int64_t Value::IntegerValue() const
{
    Local<Context> ctx = Isolate::GetCurrent()->GetCurrentContext();
    Maybe<int64_t> result = IntegerValue(ctx);
    if (result.IsNothing())
        return 0;
    return result.FromJust();
}

uint32_t Value::Uint32Value() const
{
    auto obj = Utils::OpenHandle(this);
    if (obj->IsNumber())
        return NumberToInt32(*obj);

    auto context = reinterpret_cast<v8::Isolate*>(Isolate::GetCurrent())->GetCurrentContext();
    return Uint32Value((context)).FromMaybe(0);
}

Local<v8::Function> FunctionTemplate::GetFunction()
{
    auto context = reinterpret_cast<v8::Isolate*>(Isolate::GetCurrent())->GetCurrentContext();
    return GetFunction(context).FromMaybe(Local<Function>());
}

MaybeLocal<Value> JSON::Parse(Isolate* isolate, Local<String> json_string)
{
    return Parse(isolate->GetCurrentContext(), json_string);
}

bool v8::Object::Delete(v8::Local<Value> key)
{
    auto context = ContextFromNeverReadOnlySpaceObject(Utils::OpenHandle(this));
    return Delete(context, key).FromMaybe(false);
}

Local<Function> Function::New(Isolate* isolate, FunctionCallback callback,
    Local<Value> data, int length)
{
    return New(isolate->GetCurrentContext(), callback, data, length)
        .FromMaybe(Local<Function>());
}

Local<String> v8::String::Concat(Local<String> left, Local<String> right)
{
    Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(Isolate::GetCurrent());
    return Concat(v8_isolate, left, right);
}

#define PREPARE_FOR_EXECUTION_PRIMITIVE(context, class_name, function_name, T) \
    PREPARE_FOR_EXECUTION_WITH_CONTEXT(context, class_name, function_name,     \
        Nothing<T>(), i::HandleScope, false)

static i::MaybeHandle<i::Object> DefineObjectProperty(
    i::Handle<i::JSObject> js_object, i::Handle<i::Object> key,
    i::Handle<i::Object> value, i::PropertyAttributes attrs)
{
    i::Isolate* isolate = js_object->GetIsolate();
    bool success = false;
    i::LookupIterator it = i::LookupIterator::PropertyOrElement(isolate, js_object, key, &success, i::LookupIterator::OWN);
    if (!success)
        return i::MaybeHandle<i::Object>();

    return i::JSObject::DefineOwnPropertyIgnoreAttributes(&it, value, attrs, i::JSObject::FORCE_FIELD);
}

Maybe<bool> v8::Object::ForceSet(v8::Local<v8::Context> context,
    v8::Local<Value> key, v8::Local<Value> value,
    v8::PropertyAttribute attribs)
{
    PREPARE_FOR_EXECUTION_PRIMITIVE(context, Object, ForceSet, bool);
    auto self = i::Handle<i::JSObject>::cast(Utils::OpenHandle(this));
    auto key_obj = Utils::OpenHandle(*key);
    auto value_obj = Utils::OpenHandle(*value);
    has_pending_exception = DefineObjectProperty(self, key_obj, value_obj, static_cast<i::PropertyAttributes>(attribs)).is_null();
    RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
    return Just(true);
}

Local<v8::Value> Function::Call(v8::Local<v8::Value> recv, int argc, v8::Local<v8::Value> argv[])
{
    Isolate* isolate = Isolate::GetCurrent();
    MaybeLocal<Value> result = Call(isolate->GetCurrentContext(), recv, argc, argv);
    if (result.IsEmpty())
        return Local<Value>();
    return result.ToLocalChecked();
}

MaybeLocal<Array> Debug::GetInternalProperties(Isolate* v8_isolate, Local<Value> value)
{
    return debug::GetInternalProperties(v8_isolate, value);
}

void HeapProfiler::SetWrapperClassInfoProvider(uint16_t class_id,
    WrapperInfoCallback callback)
{
    // reinterpret_cast<i::HeapProfiler*>(this)->DefineWrapperClass(class_id, callback);
}

double Value::NumberValue() const
{
    Local<Context> ctx = Isolate::GetCurrent()->GetCurrentContext();
    Maybe<double> result = NumberValue(ctx);
    if (result.IsNothing())
        return 0;
    return result.FromJust();
}

MaybeLocal<Value> Debug::GetMirror(Local<v8::Context>, Local<v8::Value>)
{
    base::OS::DebugBreak();
    return MaybeLocal<Value>();
}

void Debug::ProcessDebugMessages(Isolate* isolate)
{
    base::OS::DebugBreak();
}

void Debug::SetMessageHandler(v8::Isolate*, void (*)(v8::Debug::Message const&))
{
    base::OS::DebugBreak();
}

void Debug::SendCommand(Isolate* isolate, const uint16_t* command, int length, Debug::ClientData* client_data)
{
    base::OS::DebugBreak();
}

} // namespace v8
